[nrf fromtree][OpenThread] Harden DNS record parsing #375
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OpenThread applications would crash upon receiving an empty DNS TXT record. The reason was that the code for copying OT DNS service info object into Matter DnssdService object would not initialize the TXT entry count in the latter object in such a case. In the reported case, the Matter stack was presented an empty TXT record because OpenThread's DNS client received a TXT record with TTL 0 and it discarded its contents. Nevertheless, the issue could be reproduced by publishing Matter service without TXT entries and kicking off DNS query. 1. Initialize the TXT entry and subtype count properly in all scenarios. 2. Do not even process the service info object if an error was returned by OpenThread before. 3. Extract some boilerplate to a separate function to improve readability. Signed-off-by: Damian Krolik <[email protected]>
LuDuda
approved these changes
Jan 10, 2024
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OpenThread applications would crash upon receiving an empty DNS TXT record. The reason was that the code for copying OT DNS service info object into Matter DnssdService object would not initialize the TXT entry count in the latter object in such a case.
In the reported case, the Matter stack was presented an empty TXT record because OpenThread's DNS client received a TXT record with TTL 0 and it discarded its contents. Nevertheless, the issue could be reproduced by publishing Matter service without TXT entries and kicking off DNS query.