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block: make bioset_exit() fully resilient against being called twice
[ Upstream commit 605f741 ] 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: be4d234 ("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>
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