From d577508727226d44a713f1af38b08769546edd2a Mon Sep 17 00:00:00 2001
From: Ivan Nardi <12729895+IvanNardi@users.noreply.github.com>
Date: Wed, 24 Jan 2024 21:16:58 +0100
Subject: fuzz: extend fuzzing coverage (#2281)

---
 fuzz/Makefile.am                                   |  29 +++++---
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 .../f6fd7dd2bb4542f3d8d253768b6d63777d048afa       | Bin 1040 -> 0 bytes
 .../f9cce96c161f401d73f04ef031404a885eb5da37       | Bin 1024 -> 0 bytes
 .../fad5cb6b51a97763038b58addeaa2bd725293ac8       | Bin 1040 -> 0 bytes
 .../fdd08d361bc7e016b6ad2e41d8b167bff2178777       | Bin 1024 -> 0 bytes
 .../ff72929db2b1fdacd24b1aed103bb307bbac7d7f       | Bin 1263 -> 0 bytes
 .../ff82aaaf9375f24492e1bc709bf1518b827fc83d       | Bin 1219 -> 0 bytes
 fuzz/corpus/fuzz_filecfg_category/comment.txt      |   1 +
 fuzz/corpus/fuzz_filecfg_category/example.txt      |   1 +
 fuzz/fuzz_common_code.c                            |   1 +
 fuzz/fuzz_config.cpp                               |  74 ++++++++++++++++++---
 fuzz/fuzz_ds_ahocorasick.cpp                       |   6 +-
 fuzz/fuzz_ds_patricia.cpp                          |  64 +++++++++++++++---
 fuzz/fuzz_filecfg_category.c                       |  27 ++++++++
 fuzz/ipv4_addresses.txt                            |   1 +
 130 files changed, 177 insertions(+), 27 deletions(-)
 delete mode 100644 fuzz/corpus/fuzz_ds_patricia/04d093aff831ee1f106282b79281614b8142d91f
 delete mode 100644 fuzz/corpus/fuzz_ds_patricia/080eefec3d658696f6fdaf478e5ac1739c74e87b
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 delete mode 100644 fuzz/corpus/fuzz_ds_patricia/0d001e9c537a1cf7da294ea889f4e2e9ce3c13e0
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 delete mode 100644 fuzz/corpus/fuzz_ds_patricia/8b3d2f65163ff2351bf9a5bbf7dfbaeace054246
 delete mode 100644 fuzz/corpus/fuzz_ds_patricia/8b3fa51f3ea12e0ab1f2e4338f0bbdd167995c98
 delete mode 100644 fuzz/corpus/fuzz_ds_patricia/8dc1dd8e66922ff701c798bbe91d19b37f58495f
 delete mode 100644 fuzz/corpus/fuzz_ds_patricia/8e77a1ae0ef5ee0974856f2a0318b46e98f0e4f9
 delete mode 100644 fuzz/corpus/fuzz_ds_patricia/8f2f7f037ede54b9812983536b8a973db7dfe5ec
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 delete mode 100644 fuzz/corpus/fuzz_ds_patricia/921441816405adb82a95beb9e829eb2d07364e39
 delete mode 100644 fuzz/corpus/fuzz_ds_patricia/94cfe0c7f792ee42ff43e5559fe0375323b9b68a
 delete mode 100644 fuzz/corpus/fuzz_ds_patricia/95107e7dc7612da1d0905556f401953c06b3507e
 delete mode 100644 fuzz/corpus/fuzz_ds_patricia/9764794fc2c7bcb80ca3f42525e4d4e8e32a088f
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 create mode 100644 fuzz/corpus/fuzz_filecfg_category/comment.txt
 create mode 100644 fuzz/corpus/fuzz_filecfg_category/example.txt
 create mode 100644 fuzz/fuzz_filecfg_category.c

(limited to 'fuzz')

diff --git a/fuzz/Makefile.am b/fuzz/Makefile.am
index a0cfc501c..162e02864 100644
--- a/fuzz/Makefile.am
+++ b/fuzz/Makefile.am
@@ -8,7 +8,7 @@ bin_PROGRAMS += fuzz_libinjection fuzz_binaryfusefilter
 #Internal crypto
 bin_PROGRAMS += fuzz_gcrypt_light fuzz_gcrypt_aes fuzz_gcrypt_gcm fuzz_gcrypt_cipher
 #Configuration files
-bin_PROGRAMS += fuzz_filecfg_protocols fuzz_filecfg_categories fuzz_filecfg_malicious_sha1 fuzz_filecfg_malicious_ja3 fuzz_filecfg_risk_domains fuzz_filecfg_config
+bin_PROGRAMS += fuzz_filecfg_protocols fuzz_filecfg_categories fuzz_filecfg_malicious_sha1 fuzz_filecfg_malicious_ja3 fuzz_filecfg_risk_domains fuzz_filecfg_config fuzz_filecfg_category
 #Reader utils
 bin_PROGRAMS += fuzz_readerutils_workflow fuzz_readerutils_parseprotolist
 
@@ -576,6 +576,19 @@ fuzz_filecfg_config_LINK=$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
     $(LIBTOOLFLAGS) --mode=link $(CXX) @NDPI_CFLAGS@ $(AM_CXXFLAGS) $(CXXFLAGS) \
     $(fuzz_filecfg_config_LDFLAGS) @NDPI_LDFLAGS@ $(LDFLAGS) -o $@
 
+fuzz_filecfg_category_SOURCES = fuzz_filecfg_category.c fuzz_common_code.c
+fuzz_filecfg_category_CFLAGS = -I../src/lib/ @NDPI_CFLAGS@ $(CXXFLAGS) -DNDPI_LIB_COMPILATION
+fuzz_filecfg_category_LDADD = ../src/lib/libndpi.a $(ADDITIONAL_LIBS)
+fuzz_filecfg_category_LDFLAGS = $(LIBS)
+if HAS_FUZZLDFLAGS
+fuzz_filecfg_category_CFLAGS += $(LIB_FUZZING_ENGINE)
+fuzz_filecfg_category_LDFLAGS += $(LIB_FUZZING_ENGINE)
+endif
+# force usage of CXX for linker
+fuzz_filecfg_category_LINK=$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+    $(LIBTOOLFLAGS) --mode=link $(CXX) @NDPI_CFLAGS@ $(AM_CXXFLAGS) $(CXXFLAGS) \
+    $(fuzz_filecfg_category_LDFLAGS) @NDPI_LDFLAGS@ $(LDFLAGS) -o $@
+
 fuzz_readerutils_workflow_SOURCES = fuzz_readerutils_workflow.cpp fuzz_common_code.c ../example/reader_util.c
 fuzz_readerutils_workflow_CXXFLAGS = -I../example/ @NDPI_CFLAGS@ $(CXXFLAGS)
 fuzz_readerutils_workflow_CFLAGS = @NDPI_CFLAGS@ $(CXXFLAGS)
@@ -640,10 +653,6 @@ files_corpus_fuzz_is_stun_tcp :=  $(wildcard corpus/fuzz_is_stun_tcp/*)
 fuzz_is_stun_tcp_seed_corpus.zip: $(files_corpus_fuzz_is_stun_tcp)
 	zip -j fuzz_is_stun_tcp_seed_corpus.zip $(files_corpus_fuzz_is_stun_tcp)
 
-files_corpus_fuzz_ds_patricia :=  $(wildcard corpus/fuzz_ds_patricia/*)
-fuzz_ds_patricia_seed_corpus.zip: $(files_corpus_fuzz_ds_patricia)
-	zip -j fuzz_ds_patricia_seed_corpus.zip $(files_corpus_fuzz_ds_patricia)
-
 files_corpus_fuzz_alg_ses_des :=  $(wildcard corpus/fuzz_alg_ses_des/*)
 fuzz_alg_ses_des_seed_corpus.zip: $(files_corpus_fuzz_alg_ses_des)
 	zip -j fuzz_alg_ses_des_seed_corpus.zip $(files_corpus_fuzz_alg_ses_des)
@@ -712,6 +721,10 @@ files_corpus_fuzz_filecfg_config :=  $(wildcard corpus/fuzz_filecfg_config/*)
 fuzz_filecfg_config_seed_corpus.zip: $(files_corpus_fuzz_filecfg_config)
 	zip -j fuzz_filecfg_config_seed_corpus.zip $(files_corpus_fuzz_filecfg_config)
 
+files_corpus_fuzz_filecfg_category :=  $(wildcard corpus/fuzz_filecfg_category/*)
+fuzz_filecfg_category_seed_corpus.zip: $(files_corpus_fuzz_filecfg_category)
+	zip -j fuzz_filecfg_category_seed_corpus.zip $(files_corpus_fuzz_filecfg_category)
+
 files_corpus_fuzz_readerutils_workflow :=  $(wildcard corpus/fuzz_readerutils_workflow/*)
 fuzz_readerutils_workflow_seed_corpus.zip: $(files_corpus_fuzz_readerutils_workflow)
 	zip -j fuzz_readerutils_workflow_seed_corpus.zip $(files_corpus_fuzz_readerutils_workflow)
@@ -728,7 +741,7 @@ files_corpus_fuzz_ds_domain_classify :=  $(wildcard corpus/fuzz_ds_domain_classi
 fuzz_ds_domain_classify_seed_corpus.zip: $(files_corpus_fuzz_ds_domain_classify)
 	zip -j fuzz_ds_domain_classify_seed_corpus.zip $(files_corpus_fuzz_ds_domain_classify)
 
-corpus: fuzz_ndpi_reader_seed_corpus.zip fuzz_ndpi_reader_alloc_fail_seed_corpus.zip fuzz_ndpi_reader_payload_analyzer_seed_corpus.zip fuzz_quic_get_crypto_data_seed_corpus.zip fuzz_ds_patricia_seed_corpus.zip fuzz_alg_ses_des_seed_corpus.zip fuzz_alg_bins_seed_corpus.zip fuzz_alg_hll_seed_corpus.zip fuzz_alg_jitter_seed_corpus.zip fuzz_ds_libcache_seed_corpus.zip fuzz_community_id_seed_corpus.zip fuzz_ds_tree_seed_corpus.zip fuzz_serialization_seed_corpus.zip fuzz_ds_ptree_seed_corpus.zip fuzz_alg_crc32_md5_seed_corpus.zip fuzz_alg_bytestream_seed_corpus.zip fuzz_libinjection_seed_corpus.zip fuzz_tls_certificate_seed_corpus.zip fuzz_filecfg_protocols_seed_corpus.zip fuzz_readerutils_workflow_seed_corpus.zip fuzz_readerutils_parseprotolist_seed_corpus.zip fuzz_ds_bitmap64_seed_corpus.zip fuzz_ds_domain_classify_seed_corpus.zip fuzz_filecfg_protocols_seed_corpus.zip fuzz_filecfg_config_seed_corpus.zip fuzz_is_stun_udp_seed_corpus.zip fuzz_is_stun_tcp_seed_corpus.zip fuzz_filecfg_malicious_sha1_seed_corpus.zip fuzz_filecfg_malicious_ja3_seed_corpus.zip fuzz_filecfg_risk_domains_seed_corpus.zip
+corpus: fuzz_ndpi_reader_seed_corpus.zip fuzz_ndpi_reader_alloc_fail_seed_corpus.zip fuzz_ndpi_reader_payload_analyzer_seed_corpus.zip fuzz_quic_get_crypto_data_seed_corpus.zip fuzz_alg_ses_des_seed_corpus.zip fuzz_alg_bins_seed_corpus.zip fuzz_alg_hll_seed_corpus.zip fuzz_alg_jitter_seed_corpus.zip fuzz_ds_libcache_seed_corpus.zip fuzz_community_id_seed_corpus.zip fuzz_ds_tree_seed_corpus.zip fuzz_serialization_seed_corpus.zip fuzz_ds_ptree_seed_corpus.zip fuzz_alg_crc32_md5_seed_corpus.zip fuzz_alg_bytestream_seed_corpus.zip fuzz_libinjection_seed_corpus.zip fuzz_tls_certificate_seed_corpus.zip fuzz_filecfg_protocols_seed_corpus.zip fuzz_readerutils_workflow_seed_corpus.zip fuzz_readerutils_parseprotolist_seed_corpus.zip fuzz_ds_bitmap64_seed_corpus.zip fuzz_ds_domain_classify_seed_corpus.zip fuzz_filecfg_protocols_seed_corpus.zip fuzz_filecfg_categories_seed_corpus.zip fuzz_filecfg_config_seed_corpus.zip fuzz_filecfg_category_seed_corpus.zip fuzz_is_stun_udp_seed_corpus.zip fuzz_is_stun_tcp_seed_corpus.zip fuzz_filecfg_malicious_sha1_seed_corpus.zip fuzz_filecfg_malicious_ja3_seed_corpus.zip fuzz_filecfg_risk_domains_seed_corpus.zip
 	cp corpus/fuzz_*seed_corpus.zip .
 
 #Create dictionaries exactly as expected by oss-fuzz.
@@ -762,6 +775,7 @@ distdir:
 		-o -path './corpus/fuzz_filecfg_malicious_ja3/*' \
 		-o -path './corpus/fuzz_filecfg_risk_domains/*' \
 		-o -path './corpus/fuzz_filecfg_config/*' \
+		-o -path './corpus/fuzz_filecfg_category/*' \
 		-o -path './corpus/fuzz_readerutils_workflow/*' \
 		-o -path './corpus/fuzz_readerutils_parseprotolist/*' \
 		-o -path './corpus/fuzz_is_stun_udp/*' \
@@ -780,7 +794,6 @@ distdir:
 		-o -path './corpus/fuzz_ds_tree/*' \
 		-o -path './corpus/fuzz_ds_bitmap64/*' \
 		-o -path './corpus/fuzz_ds_domain_classify/*' \
-		-o -path './corpus/fuzz_ds_ptree/*' \
-		-o -path './corpus/fuzz_ds_patricia/*' | xargs -I'{}' cp -r '{}' '$(distdir)/{}'
+		-o -path './corpus/fuzz_ds_ptree/*' | xargs -I'{}' cp -r '{}' '$(distdir)/{}'
 
 all: corpus dictionaries
diff --git a/fuzz/corpus/fuzz_ds_patricia/04d093aff831ee1f106282b79281614b8142d91f b/fuzz/corpus/fuzz_ds_patricia/04d093aff831ee1f106282b79281614b8142d91f
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diff --git a/fuzz/corpus/fuzz_filecfg_category/comment.txt b/fuzz/corpus/fuzz_filecfg_category/comment.txt
new file mode 100644
index 000000000..99e8589b5
--- /dev/null
+++ b/fuzz/corpus/fuzz_filecfg_category/comment.txt
@@ -0,0 +1 @@
+#comment
diff --git a/fuzz/corpus/fuzz_filecfg_category/example.txt b/fuzz/corpus/fuzz_filecfg_category/example.txt
new file mode 100644
index 000000000..a4bb082c2
--- /dev/null
+++ b/fuzz/corpus/fuzz_filecfg_category/example.txt
@@ -0,0 +1 @@
+lop.programtts.top
diff --git a/fuzz/fuzz_common_code.c b/fuzz/fuzz_common_code.c
index 4dbcf3018..d4311b1b6 100644
--- a/fuzz/fuzz_common_code.c
+++ b/fuzz/fuzz_common_code.c
@@ -44,6 +44,7 @@ void fuzz_init_detection_module(struct ndpi_detection_module_struct **ndpi_info_
     ndpi_set_config(*ndpi_info_mod, NULL, "log.level", "3");
     ndpi_set_config(*ndpi_info_mod, "all", "log", "enable");
 
+    ndpi_load_domain_suffixes(*ndpi_info_mod, "public_suffix_list.dat");
     ndpi_load_categories_dir(*ndpi_info_mod, "./lists/");
     ndpi_load_protocols_file(*ndpi_info_mod, "protos.txt");
     ndpi_load_categories_file(*ndpi_info_mod, "categories.txt", NULL);
diff --git a/fuzz/fuzz_config.cpp b/fuzz/fuzz_config.cpp
index b85f3752f..f99b87358 100644
--- a/fuzz/fuzz_config.cpp
+++ b/fuzz/fuzz_config.cpp
@@ -32,6 +32,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   char cfg_value[32];
   char cfg_proto[32];
   char cfg_param[32];
+  u_int64_t cat_userdata = 0;
 
 
   /* Just to be sure to have some data */
@@ -65,16 +66,32 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   if(fuzzed_data.ConsumeBool())
     ndpi_load_protocols_file(ndpi_info_mod, "protos.txt");
   if(fuzzed_data.ConsumeBool())
-    ndpi_load_categories_file(ndpi_info_mod, "categories.txt", NULL);
+    ndpi_load_protocols_file(ndpi_info_mod, fuzzed_data.ConsumeBool() ? NULL : "invalid_filename"); /* Error */
+  if(fuzzed_data.ConsumeBool())
+    ndpi_load_categories_file(ndpi_info_mod, "categories.txt", &cat_userdata);
+  if(fuzzed_data.ConsumeBool())
+    ndpi_load_categories_file(ndpi_info_mod, fuzzed_data.ConsumeBool() ? NULL : "invalid_filename", &cat_userdata); /* Error */
   if(fuzzed_data.ConsumeBool())
     ndpi_load_risk_domain_file(ndpi_info_mod, "risky_domains.txt");
+  if(fuzzed_data.ConsumeBool())
+    ndpi_load_risk_domain_file(ndpi_info_mod, fuzzed_data.ConsumeBool() ? NULL : "invalid_filename"); /* Error */
   if(fuzzed_data.ConsumeBool())
     ndpi_load_malicious_ja3_file(ndpi_info_mod, "ja3_fingerprints.csv");
+  if(fuzzed_data.ConsumeBool())
+    ndpi_load_malicious_ja3_file(ndpi_info_mod, fuzzed_data.ConsumeBool() ? NULL : "invalid_filename"); /* Error */
   if(fuzzed_data.ConsumeBool())
     ndpi_load_malicious_sha1_file(ndpi_info_mod, "sha1_fingerprints.csv");
-  /* Note that this function is not used by ndpiReader */
   if(fuzzed_data.ConsumeBool())
+    ndpi_load_malicious_sha1_file(ndpi_info_mod, fuzzed_data.ConsumeBool() ? NULL : "invalid_filename"); /* Error */
+  if(fuzzed_data.ConsumeBool())
+    ndpi_load_domain_suffixes(ndpi_info_mod, (char *)"public_suffix_list.dat");
+  if(fuzzed_data.ConsumeBool())
+    ndpi_load_domain_suffixes(ndpi_info_mod, fuzzed_data.ConsumeBool() ? NULL : (char *)"invalid_filename"); /* Error */
+  /* Note that this function is not used by ndpiReader */
+  if(fuzzed_data.ConsumeBool()) {
+    ndpi_load_ipv4_ptree(ndpi_info_mod, "invalid_filename", NDPI_PROTOCOL_TLS);
     ndpi_load_ipv4_ptree(ndpi_info_mod, "ipv4_addresses.txt", NDPI_PROTOCOL_TLS);
+  }
 
   /* TODO: stub for geo stuff */
   ndpi_load_geoip(ndpi_info_mod, NULL, NULL);
@@ -92,11 +109,13 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     value = fuzzed_data.ConsumeIntegralInRange(0, 365 + 1);
     sprintf(cfg_value, "%d", value);
     ndpi_set_config(ndpi_info_mod, "tls", "certificate_expiration_threshold", cfg_value);
+    ndpi_get_config(ndpi_info_mod, "tls", "certificate_expiration_threshold", cfg_value, sizeof(cfg_value));
   }
   if(fuzzed_data.ConsumeBool()) {
     value = fuzzed_data.ConsumeIntegralInRange(0, 1 + 1);
     sprintf(cfg_value, "%d", value);
     ndpi_set_config(ndpi_info_mod, "tls", "application_blocks_tracking", cfg_value);
+    ndpi_get_config(ndpi_info_mod, "tls", "application_blocks_tracking", cfg_value, sizeof(cfg_value));
   }
   if(fuzzed_data.ConsumeBool()) {
     value = fuzzed_data.ConsumeIntegralInRange(0, 1 + 1);
@@ -152,6 +171,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     value = fuzzed_data.ConsumeIntegralInRange(0, 1 + 1);
     sprintf(cfg_value, "%d", value);
     ndpi_set_config(ndpi_info_mod, "any", "log", cfg_value);
+    ndpi_get_config(ndpi_info_mod, "any", "log", cfg_value, sizeof(cfg_value));
   }
   for(i = 0; i < NDPI_MAX_SUPPORTED_PROTOCOLS; i++) {
     if(fuzzed_data.ConsumeBool()) {
@@ -160,12 +180,14 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
       sprintf(cfg_proto, "%d", i);
       /* TODO: we should try to map integer into name */
       ndpi_set_config(ndpi_info_mod, cfg_proto, "log", cfg_value);
+      ndpi_get_config(ndpi_info_mod, cfg_proto, "log", cfg_value, sizeof(cfg_value));
     }
   }
   if(fuzzed_data.ConsumeBool()) {
     value = fuzzed_data.ConsumeIntegralInRange(0, 1 + 1);
     sprintf(cfg_value, "%d", value);
     ndpi_set_config(ndpi_info_mod, "any", "ip_list.load", cfg_value);
+    ndpi_get_config(ndpi_info_mod, "any", "ip_list.load", cfg_value, sizeof(cfg_value));
   }
   for(i = 0; i < NDPI_MAX_SUPPORTED_PROTOCOLS; i++) {
     if(fuzzed_data.ConsumeBool()) {
@@ -173,6 +195,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
       sprintf(cfg_value, "%d", value);
       sprintf(cfg_proto, "%d", i);
       ndpi_set_config(ndpi_info_mod, cfg_proto, "ip_list.load", cfg_value);
+      ndpi_get_config(ndpi_info_mod, cfg_proto, "ip_list.load", cfg_value, sizeof(cfg_value));
     }
   }
   if(fuzzed_data.ConsumeBool()) {
@@ -230,6 +253,10 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     sprintf(cfg_value, "%d", value);
     ndpi_set_config(ndpi_info_mod, NULL, "flow_risk.crawler_bot.list.load", cfg_value);
   }
+  if(fuzzed_data.ConsumeBool()) {
+    ndpi_set_config(ndpi_info_mod, NULL, "filename.config", fuzzed_data.ConsumeBool() ? NULL : (char *)"config.txt");
+    ndpi_get_config(ndpi_info_mod, NULL, "filename.config", cfg_value, sizeof(cfg_value));
+  }
   if(fuzzed_data.ConsumeBool()) {
     value = fuzzed_data.ConsumeIntegralInRange(0, 3 + 1);
     sprintf(cfg_value, "%d", value);
@@ -323,9 +350,11 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
       value = fuzzed_data.ConsumeIntegralInRange(0, 16777215 / 2); /* max / 2 instead of max + 1 to avoid oom on oss-fuzzer */
       sprintf(cfg_param, "lru.%s.size", name);
       ndpi_set_config(ndpi_info_mod, NULL, cfg_param, cfg_value);
+      ndpi_get_config(ndpi_info_mod, NULL, cfg_param, cfg_value, sizeof(cfg_value));
       value = fuzzed_data.ConsumeIntegralInRange(0, 16777215 + 1);
       sprintf(cfg_param, "lru.%s.ttl", name);
       ndpi_set_config(ndpi_info_mod, NULL, cfg_param, cfg_value);
+      ndpi_get_config(ndpi_info_mod, NULL, cfg_param, cfg_value, sizeof(cfg_value));
     }
   }
   /* Invalid parameter */
@@ -333,13 +362,19 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     value = fuzzed_data.ConsumeIntegralInRange(0, 1 + 1);
     sprintf(cfg_value, "%d", value);
     ndpi_set_config(ndpi_info_mod, NULL, "foo", cfg_value);
+    ndpi_get_config(ndpi_info_mod, NULL, "foo", cfg_value, sizeof(cfg_value));
   }
   /* Invalid value */
   if(fuzzed_data.ConsumeBool()) {
     sprintf(cfg_value, "%s", "jjj");
     ndpi_set_config(ndpi_info_mod, NULL, "lru.stun_zoom.ttl", cfg_value);
+    ndpi_get_config(ndpi_info_mod, NULL, "lru.stun_zoom.ttl", cfg_value, sizeof(cfg_value));
   }
 
+  ndpi_add_host_risk_mask(ndpi_info_mod,
+                          (char *)fuzzed_data.ConsumeBytesAsString(32).c_str(),
+                          static_cast<ndpi_risk>(fuzzed_data.ConsumeIntegral<u_int64_t>()));
+
   ndpi_finalize_initialization(ndpi_info_mod);
 
   /* Random protocol configuration */
@@ -355,8 +390,26 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   ndpi_is_subprotocol_informative(ndpi_info_mod, pid);
   ndpi_get_proto_breed(ndpi_info_mod, pid);
 
+  ndpi_port_range d_port[MAX_DEFAULT_PORTS] = {};
+  ndpi_set_proto_defaults(ndpi_info_mod, 0, 0, NDPI_PROTOCOL_SAFE, pid,
+                          protoname, NDPI_PROTOCOL_CATEGORY_UNSPECIFIED,
+			  d_port, d_port);
+
   ndpi_get_proto_by_name(ndpi_info_mod, NULL); /* Error */
   ndpi_get_proto_by_name(ndpi_info_mod, "foo"); /* Invalid protocol */
+  ndpi_get_proto_name(ndpi_info_mod, pid);
+  ndpi_get_protocol_id(ndpi_info_mod, protoname);
+
+  struct in_addr pin;
+  struct in6_addr pin6;
+  pin.s_addr = fuzzed_data.ConsumeIntegral<u_int32_t>();
+  ndpi_network_port_ptree_match(ndpi_info_mod, &pin, fuzzed_data.ConsumeIntegral<u_int16_t>());
+  for(i = 0; i < 16; i++)
+    pin6.s6_addr[i] = fuzzed_data.ConsumeIntegral<u_int8_t>();
+  ndpi_network_port_ptree6_match(ndpi_info_mod, &pin6, fuzzed_data.ConsumeIntegral<u_int16_t>());
+
+  ndpi_get_host_domain_suffix(ndpi_info_mod, fuzzed_data.ConsumeBool() ? NULL : "www.bbc.co.uk");
+  ndpi_get_host_domain(ndpi_info_mod, fuzzed_data.ConsumeBool() ? NULL : "www.bbc.co.uk");
 
   /* Custom category configuration */
   cat = fuzzed_data.ConsumeIntegralInRange(static_cast<int>(NDPI_PROTOCOL_CATEGORY_CUSTOM_1),
@@ -376,10 +429,10 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
 
   ndpi_self_check_host_match(stdout);
 
-  ndpi_dump_protocols(ndpi_info_mod, stdout);
-  ndpi_generate_options(fuzzed_data.ConsumeIntegralInRange(0, 4), stdout);
-  ndpi_dump_risks_score(stdout);
-  ndpi_dump_config(ndpi_info_mod, stdout);
+  ndpi_dump_protocols(ndpi_info_mod, fuzzed_data.ConsumeBool() ? NULL : stdout);
+  ndpi_generate_options(fuzzed_data.ConsumeIntegralInRange(0, 4), fuzzed_data.ConsumeBool() ? NULL : stdout);
+  ndpi_dump_risks_score(fuzzed_data.ConsumeBool() ? NULL : stdout);
+  ndpi_dump_config(ndpi_info_mod, fuzzed_data.ConsumeBool() ? NULL : stdout);
 
   /* Basic code to try testing this "config" */
   bool_value = fuzzed_data.ConsumeBool();
@@ -388,6 +441,12 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   memset(&flow, 0, sizeof(flow));
   std::vector<uint8_t>pkt = fuzzed_data.ConsumeRemainingBytes<uint8_t>();
 
+  const u_int8_t *l4_return;
+  u_int16_t l4_len_return;
+  u_int8_t l4_protocol_return;
+  ndpi_detection_get_l4(pkt.data(), pkt.size(), &l4_return, &l4_len_return, &l4_protocol_return, NDPI_DETECTION_ONLY_IPV6);
+  ndpi_detection_get_l4(pkt.data(), pkt.size(), &l4_return, &l4_len_return, &l4_protocol_return, NDPI_DETECTION_ONLY_IPV4);
+
   ndpi_detection_process_packet(ndpi_info_mod, &flow, pkt.data(), pkt.size(), 0, &input_info);
   p = ndpi_detection_giveup(ndpi_info_mod, &flow, &protocol_was_guessed);
 
@@ -406,7 +465,6 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   ndpi_get_http_method(ndpi_info_mod, bool_value ? &flow : NULL);
   ndpi_get_http_url(ndpi_info_mod, &flow);
   ndpi_get_http_content_type(ndpi_info_mod, &flow);
-  check_for_email_address(ndpi_info_mod, 0);
   ndpi_get_flow_name(bool_value ? &flow : NULL);
   /* ndpi_guess_undetected_protocol() is a "strange" function. Try fuzzing it, here */
   if(!ndpi_is_protocol_detected(ndpi_info_mod, p)) {
@@ -423,7 +481,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
                                         flow.c_address.v4, flow.c_port,
                                         flow.s_address.v4, flow.s_port);
     } else {
-      ndpi_find_ipv6_category_userdata(ndpi_info_mod, (struct in6_addr *)flow.c_address.v6);
+      ndpi_find_ipv6_category_userdata(ndpi_info_mod, bool_value ? NULL : (struct in6_addr *)flow.c_address.v6);
     }
     /* Another "strange" function: fuzz it here, for lack of a better alternative */
     ndpi_search_tcp_or_udp(ndpi_info_mod, &flow);
diff --git a/fuzz/fuzz_ds_ahocorasick.cpp b/fuzz/fuzz_ds_ahocorasick.cpp
index 3333cad3e..949cc4b6d 100644
--- a/fuzz/fuzz_ds_ahocorasick.cpp
+++ b/fuzz/fuzz_ds_ahocorasick.cpp
@@ -23,6 +23,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   u_int16_t protocol_id;
   ndpi_protocol_category_t category;
   ndpi_protocol_breed_t breed;
+  u_int32_t unused;
 
   /* TODO: real string instead of random bytes */
 
@@ -120,7 +121,9 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
 
     ndpi_free(value_dup);
 
-    ndpi_match_string(a2, (char *)value.c_str());
+    ndpi_match_string(a2, fuzzed_data.ConsumeBool() ? NULL : (char *)value.c_str());
+    ndpi_match_string_value(a2, fuzzed_data.ConsumeBool() ? NULL : (char *)value.c_str(),
+                            strlen(value.c_str()), &unused);
     ndpi_match_string_protocol_id(a2, (char *)value.c_str(), strlen(value.c_str()),
                                   &protocol_id, &category, &breed);
   }
@@ -133,6 +136,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     ac_automata_search(a, &ac_input_text, &match);
 
     ndpi_match_string(a2, value_added);
+    ndpi_match_string_value(a2, value_added, strlen(value_added), &unused);
     ndpi_match_string_protocol_id(a2, value_added, strlen(value_added),
                                   &protocol_id, &category, &breed);
 
diff --git a/fuzz/fuzz_ds_patricia.cpp b/fuzz/fuzz_ds_patricia.cpp
index 58e098b45..1bd2e2d0d 100644
--- a/fuzz/fuzz_ds_patricia.cpp
+++ b/fuzz/fuzz_ds_patricia.cpp
@@ -20,10 +20,11 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   u_int16_t i, num_iteration, ip_len;
   ndpi_patricia_tree_t *p, *p_cloned;
   u_int16_t maxbits;
-  int is_ipv6, is_added = 0;
+  int is_added = 0;
   ndpi_prefix_t prefix, prefix_added;
   u_char *ip;
   ndpi_patricia_node_t *node;
+  int tree_type; /* 0: ipv4, 1: ipv6, 2: mac */
 
   /* Just to have some data */
   if (fuzzed_data.remaining_bytes() < 1024)
@@ -32,11 +33,13 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   /* To allow memory allocation failures */
   fuzz_set_alloc_callbacks_and_seed(size);
 
-  is_ipv6 = fuzzed_data.ConsumeBool();
-  if (is_ipv6)
+  tree_type = fuzzed_data.ConsumeIntegralInRange(0, 2);
+  if (tree_type == 0)
+    maxbits = 32;
+  else if (tree_type == 1)
     maxbits = 128;
   else
-    maxbits = 32;
+    maxbits = 48;
 
   p = ndpi_patricia_new(maxbits);
 
@@ -47,7 +50,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   /* "Random" add */
   num_iteration = fuzzed_data.ConsumeIntegral<u_int8_t>();
   for (i = 0; i < num_iteration; i++) {
-    if (!is_ipv6) {
+    if (tree_type == 0) {
       if(fuzzed_data.remaining_bytes() > 4) {
         std::vector<u_int8_t>data = fuzzed_data.ConsumeBytes<u_int8_t>(4);
 	ip = data.data();
@@ -67,7 +70,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
           assert(ndpi_patricia_get_node_u64(node) == 0);
 	}
       }
-    } else {
+    } else if (tree_type == 1){
       if(fuzzed_data.remaining_bytes() > 16) {
         std::vector<u_int8_t>data = fuzzed_data.ConsumeBytes<u_int8_t>(16);
 	ip = data.data();
@@ -87,6 +90,26 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
           assert(ndpi_patricia_get_node_u64(node) == 0);
 	}
       }
+    } else {
+      if(fuzzed_data.remaining_bytes() > 6) {
+        std::vector<u_int8_t>data = fuzzed_data.ConsumeBytes<u_int8_t>(6);
+	ip = data.data();
+        ip_len = fuzzed_data.ConsumeIntegralInRange(0, 49); /* 49 to force error */
+        ndpi_fill_prefix_mac(&prefix, ip, ip_len, 48);
+        node = ndpi_patricia_lookup(p, &prefix);
+        /* Keep one random node really added */
+	if (node && is_added == 0 && fuzzed_data.ConsumeBool()) {
+          is_added = 1;
+          prefix_added = prefix;
+	  /* Some random operations on this node */
+          ndpi_patricia_get_node_prefix(node);
+          ndpi_patricia_get_node_bits(node);
+          ndpi_patricia_set_node_data(node, NULL);
+          assert(ndpi_patricia_get_node_data(node) == NULL);
+          ndpi_patricia_set_node_u64(node, 0);
+          assert(ndpi_patricia_get_node_u64(node) == 0);
+	}
+      }
     }
   }
 
@@ -96,7 +119,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   /* "Random" exact search. Remove if found */
   num_iteration = fuzzed_data.ConsumeIntegral<u_int8_t>();
   for (i = 0; i < num_iteration; i++) {
-    if (!is_ipv6) {
+    if (tree_type == 0) {
       if(fuzzed_data.remaining_bytes() > 4) {
         std::vector<u_int8_t>data = fuzzed_data.ConsumeBytes<u_int8_t>(4);
 	ip = data.data();
@@ -106,7 +129,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
 	if (node)
           ndpi_patricia_remove(p, node);
       }
-    } else {
+    } else if (tree_type == 1) {
       if(fuzzed_data.remaining_bytes() > 16) {
         std::vector<u_int8_t>data = fuzzed_data.ConsumeBytes<u_int8_t>(16);
 	ip = data.data();
@@ -116,7 +139,18 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
 	if (node)
           ndpi_patricia_remove(p, node);
       }
+    } else {
+      if(fuzzed_data.remaining_bytes() > 6) {
+        std::vector<u_int8_t>data = fuzzed_data.ConsumeBytes<u_int8_t>(6);
+	ip = data.data();
+        ip_len = fuzzed_data.ConsumeIntegralInRange(0, 48);
+        ndpi_fill_prefix_mac(&prefix, ip, ip_len, 48);
+        node = ndpi_patricia_search_exact(p, &prefix);
+	if (node)
+          ndpi_patricia_remove(p, node);
+      }
     }
+
   }
   /* Exact search of an added node */
   if (is_added)
@@ -125,7 +159,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   /* "Random" best search. Remove if found */
   num_iteration = fuzzed_data.ConsumeIntegral<u_int8_t>();
   for (i = 0; i < num_iteration; i++) {
-    if (!is_ipv6) {
+    if (tree_type == 0) {
       if(fuzzed_data.remaining_bytes() > 4) {
         std::vector<u_int8_t>data = fuzzed_data.ConsumeBytes<u_int8_t>(4);
 	ip = data.data();
@@ -135,7 +169,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
 	if (node)
           ndpi_patricia_remove(p, node);
       }
-    } else {
+    } else if (tree_type == 1) {
       if(fuzzed_data.remaining_bytes() > 16) {
         std::vector<u_int8_t>data = fuzzed_data.ConsumeBytes<u_int8_t>(16);
 	ip = data.data();
@@ -145,6 +179,16 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
 	if (node)
           ndpi_patricia_remove(p, node);
       }
+    } else {
+      if(fuzzed_data.remaining_bytes() > 6) {
+        std::vector<u_int8_t>data = fuzzed_data.ConsumeBytes<u_int8_t>(6);
+	ip = data.data();
+        ip_len = fuzzed_data.ConsumeIntegralInRange(0, 48);
+        ndpi_fill_prefix_mac(&prefix, ip, ip_len, 48);
+        node = ndpi_patricia_search_best(p, &prefix);
+	if (node)
+          ndpi_patricia_remove(p, node);
+      }
     }
   }
   /* Best search of an added node */
diff --git a/fuzz/fuzz_filecfg_category.c b/fuzz/fuzz_filecfg_category.c
new file mode 100644
index 000000000..757ada01f
--- /dev/null
+++ b/fuzz/fuzz_filecfg_category.c
@@ -0,0 +1,27 @@
+#include "ndpi_api.h"
+#include "ndpi_private.h"
+#include "fuzz_common_code.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  struct ndpi_detection_module_struct *ndpi_struct;
+  FILE *fd;
+  NDPI_PROTOCOL_BITMASK all;
+
+  /* To allow memory allocation failures */
+  fuzz_set_alloc_callbacks_and_seed(size);
+
+  ndpi_struct = ndpi_init_detection_module();
+  NDPI_BITMASK_SET_ALL(all);
+  ndpi_set_protocol_detection_bitmask2(ndpi_struct, &all);
+
+  ndpi_set_config(ndpi_struct, NULL, "log.level", "3");
+  ndpi_set_config(ndpi_struct, "all", "log", "1");
+
+  fd = buffer_to_file(data, size);
+  load_category_file_fd(ndpi_struct, fd, NDPI_PROTOCOL_CATEGORY_VOIP /* random category */);
+  if(fd)
+    fclose(fd);
+
+  ndpi_exit_detection_module(ndpi_struct);
+  return 0;
+}
diff --git a/fuzz/ipv4_addresses.txt b/fuzz/ipv4_addresses.txt
index 209765e5a..76065bd2a 100644
--- a/fuzz/ipv4_addresses.txt
+++ b/fuzz/ipv4_addresses.txt
@@ -3,4 +3,5 @@
 192.168.5.5
 192.168.5.6/32
 192.168.4.0/24
+192.168.4.1
 
-- 
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