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Fix issue with stale caching.

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After replying with stale data, dnsmasq sends the query upstream to
refresh the cache asynchronously and sometimes sends the wrong packet:
packet length can be wrong, and if an EDE marking stale data is added
to the answer that can end up in the query also. This bug only seems
to cause problems when the usptream server is a DOH/DOT proxy. Thanks
to Justin He for the bug report.
This commit is contained in:
Simon Kelley
2023-05-01 20:42:30 +01:00
parent 7500157cff
commit d774add784
2 changed files with 59 additions and 51 deletions
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@@ -17,6 +17,14 @@ version 2.90
Add --no-dhcpv4-interface and --no-dhcpv6-interface for
better control over which inetrfaces are providing DHCP service.
Fix issue with stale caching: After replying with stale data,
dnsmasq sends the query upstream to refresh the cache asynchronously
and sometimes sends the wrong packet: packet length can be wrong,
and if an EDE marking stale data is added to the answer that can
end up in the query also. This bug only seems to cause problems
when the usptream server is a DOH/DOT proxy. Thanks to Justin He
for the bug report.
version 2.89