diff options
| author | Jens Axboe <axboe@kernel.dk> | 2022-05-29 07:13:09 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-14 18:44:57 +0200 |
| commit | b79f0b14a54d86fcb1b8e0127fd15d28f048374a (patch) | |
| tree | e19afe7f0c0e98e017c40883fb019d9e0210d6e2 | |
| parent | b2d60329a0b88c4e35017436ee29c43be59d46a5 (diff) | |
block: make bioset_exit() fully resilient against being called twice
[ Upstream commit 605f7415ecfb426610195dd6c7577b30592b3369 ]
Most of bioset_exit() is fine being called twice, as it clears the
various allocations etc when they are freed. The exception is
bio_alloc_cache_destroy(), which does not clear ->cache when it has
freed it.
This isn't necessarily a bug, but can be if buggy users does call the
exit path more then once, or with just a memset() bioset which has
never been initialized. dm appears to be one such user.
Fixes: be4d234d7aeb ("bio: add allocation cache abstraction")
Link: https://lore.kernel.org/linux-block/YpK7m+14A+pZKs5k@casper.infradead.org/
Reported-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | block/bio.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/block/bio.c b/block/bio.c index ac29c87c6735..d3ca79c3ebdf 100644 --- a/block/bio.c +++ b/block/bio.c @@ -693,6 +693,7 @@ static void bio_alloc_cache_destroy(struct bio_set *bs) bio_alloc_cache_prune(cache, -1U); } free_percpu(bs->cache); + bs->cache = NULL; } /** |