From 65becc947c796b9aacb1f6f2c9cdfbc1d808cb5f Mon Sep 17 00:00:00 2001
From: Toni Uhlig <matzeton@googlemail.com>
Date: Tue, 27 Apr 2021 20:34:47 +0200
Subject: Check datalink during fuzzing to prevent console / logfile spam. See
 #1175 for more information.

Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
---
 fuzz/fuzz_ndpi_reader.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'fuzz/fuzz_ndpi_reader.c')

diff --git a/fuzz/fuzz_ndpi_reader.c b/fuzz/fuzz_ndpi_reader.c
index 85d7c317a..49460ef4f 100644
--- a/fuzz/fuzz_ndpi_reader.c
+++ b/fuzz/fuzz_ndpi_reader.c
@@ -66,6 +66,14 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
     free(pcap_path);
     return 0;
   }
+  if (ndpi_is_datalink_supported(pcap_datalink(pkts)) == 0)
+  {
+    /* Do not fail if the datalink type is not supported (may happen often during fuzzing). */
+    pcap_close(pkts);
+    remove(pcap_path);
+    free(pcap_path);
+    return 0;
+  }
   struct ndpi_workflow * workflow = ndpi_workflow_init(prefs, pkts);
   // enable all protocols
   NDPI_BITMASK_SET_ALL(all);
-- 
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