tree 136b21d4590fc61691384dadd5eb403164638d8c
parent 734863ecfa1f8a620904fd9332e01673728c784b
author Willy Tarreau <w@1wt.eu> 1623300862 +0200
committer Willy Tarreau <w@1wt.eu> 1623831566 +0200
encoding latin1

BUG/MINOR: pools: fix a possible memory leak in the lockless pool_flush()

The lockless version of pool_flush() had a leftover of the original
version causing the pool's first entry to be set to NULL at the end.
The problem is that it does this outside of any lock and in a non-
atomic way, so that any concurrent alloc+free would result in a lost
object.

The risk is low and the consequence even lower, given that pool_flush()
is only used in pool_destroy() (hence single-threaded) or by stream_free()
during a soft-stop (not the place where most allocations happen), so in
the worst case it could result in valgrind complaining on soft-stop.

The bug was introduced with the first version of the code, in 1.9, so
the fix can be backported to all stable versions.

(cherry picked from commit c239cde26fbf0b07abdf590b77c31154bd65c566)
Signed-off-by: Willy Tarreau <w@1wt.eu>