``` ==6591==ERROR: AddressSanitizer: SEGV on unknown address 0x502000230000 (pc 0x55fbd836a5a0 bp 0x7ffdf4503670 sp 0x7ffdf4502e28 T0) ==6591==The signal is caused by a READ memory access. #0 0x55fbd836a5a0 in __sanitizer::internal_strlen(char const*) /src/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_libc.cpp:176:10 #1 0x55fbd82cfc28 in StrstrCheck(void*, char*, char const*, char const*) /src/llvm-project/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:579:17 #2 0x55fbd82cfbc2 in strstr /src/llvm-project/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:598:5 #3 0x55fbd840a04a in ndpi_strrstr /src/ndpi/src/lib/ndpi_utils.c:3471:15 #4 0x55fbd840ba95 in ndpi_get_host_domain /src/ndpi/src/lib/ndpi_domains.c:149:9 #5 0x55fbd83ef751 in ndpi_check_dga_name /src/ndpi/src/lib/ndpi_main.c:10748:17 ``` Found by oss-fuzz