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Merge branch 'bugfix/mdns_null_deref_fuzzer_v4.4_' into 'release/v4.4'

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mdns: Fix potential null deref reported by fuzzer test(v4.4)

See merge request espressif/esp-idf!17147
This commit is contained in:
David Čermák
2022-02-17 01:21:00 +00:00
parent bf7266312c c0e105cc41
commit ae6f171370
1 changed files with 2 additions and 1 deletions
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components/mdns/mdns.c
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@ -2821,7 +2821,8 @@ static bool _mdns_question_matches(mdns_parsed_question_t * question, uint16_t t
if (type == MDNS_TYPE_A || type == MDNS_TYPE_AAAA) { if (type == MDNS_TYPE_A || type == MDNS_TYPE_AAAA) {
return true; return true;
} else if (type == MDNS_TYPE_PTR || type == MDNS_TYPE_SDPTR) { } else if (type == MDNS_TYPE_PTR || type == MDNS_TYPE_SDPTR) {
if (!strcasecmp(service->service->service, question->service) if (question->service && question->proto && question->domain
&& !strcasecmp(service->service->service, question->service)
&& !strcasecmp(service->service->proto, question->proto) && !strcasecmp(service->service->proto, question->proto)
&& !strcasecmp(MDNS_DEFAULT_DOMAIN, question->domain)) { && !strcasecmp(MDNS_DEFAULT_DOMAIN, question->domain)) {
return true; return true;