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mDNS: protect MDNSResponder::queryService against misuse (#7216)

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* mDNS: protect MDNSResponder::queryService against misuse

* fix style
This commit is contained in:
david gauchard 2020-04-15 20:22:02 +02:00 committed by GitHub
parent e1789ddf0c
commit e5f4514847
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1 changed files with 6 additions and 0 deletions
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libraries/ESP8266mDNS/src/LEAmDNS.cpp
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@ -767,6 +767,12 @@ uint32_t MDNSResponder::queryService(const char* p_pcService,
const char* p_pcProtocol, const char* p_pcProtocol,
const uint16_t p_u16Timeout /*= MDNS_QUERYSERVICES_WAIT_TIME*/) const uint16_t p_u16Timeout /*= MDNS_QUERYSERVICES_WAIT_TIME*/)
{ {
if (0 == m_pUDPContext)
{
// safeguard against misuse
return 0;
}
DEBUG_EX_INFO(DEBUG_OUTPUT.printf_P(PSTR("[MDNSResponder] queryService '%s.%s'\n"), p_pcService, p_pcProtocol);); DEBUG_EX_INFO(DEBUG_OUTPUT.printf_P(PSTR("[MDNSResponder] queryService '%s.%s'\n"), p_pcService, p_pcProtocol););
uint32_t u32Result = 0; uint32_t u32Result = 0;