tree 2d879f656fc2667938d7fa2cc7058c45ea7c994c
parent cd4228e0068e080cd2526fd104e5222c2d806600
author Maxim Dounin <mdounin@mdounin.ru> 1594049777 +0300
committer Maxim Dounin <mdounin@mdounin.ru> 1594049777 +0300

Memcached: protect from too long responses.

If a memcached response was followed by a correct trailer, and then
the NUL character followed by some extra data - this was accepted by
the trailer checking code.  This in turn resulted in ctx->rest underflow
and caused negative size buffer on the next reading from the upstream,
followed by the "negative size buf in writer" alert.

Fix is to always check for too long responses, so a correct trailer cannot
be followed by extra data.