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mDNS: protect MDNSResponder::queryService against misuse #7216

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merged 2 commits into from
Apr 15, 2020
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mDNS: protect MDNSResponder::queryService against misuse #7216

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d78f27c
mDNS: protect MDNSResponder::queryService against misuse
d-a-v Apr 15, 2020
2782f3d
fix style
d-a-v Apr 15, 2020
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4 changes: 4 additions & 0 deletions libraries/ESP8266mDNS/src/LEAmDNS.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -767,6 +767,10 @@ uint32_t MDNSResponder::queryService(const char* p_pcService,
const char* p_pcProtocol,
const uint16_t p_u16Timeout /*= MDNS_QUERYSERVICES_WAIT_TIME*/)
{
if (0 == m_pUDPContext)
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Isn't this a ptr? check against nullptr?

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Yes. For coherency I sticked to this file's style.

Arduino/libraries/ESP8266mDNS/src/LEAmDNS.cpp

Line 101 in e1789dd

if (0 == m_pUDPContext)

I was afraid to modify too much for when LEAmDNS2 is coming to avoid merge complication.

// safeguard against misuse
return 0;

DEBUG_EX_INFO(DEBUG_OUTPUT.printf_P(PSTR("[MDNSResponder] queryService '%s.%s'\n"), p_pcService, p_pcProtocol););

uint32_t u32Result = 0;
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