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bcache: fix cache_set_flush() NULL pointer dereference on OOM

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When bch_cache_set_alloc() fails to kzalloc the cache_set, the
asyncronous closure handling tries to dereference a cache_set that
hadn't yet been allocated inside of cache_set_flush() which is called
by __cache_set_unregister() during cleanup.  This appears to happen only
during an OOM condition on bcache_register.

Signed-off-by: Eric Wheeler <bcache@linux.ewheeler.net>
Cc: stable@vger.kernel.org
This commit is contained in:
Eric Wheeler 2016-03-07 15:17:50 -08:00 committed by Jens Axboe
parent 9b299728ed
commit f8b11260a4
1 changed files with 3 additions and 0 deletions
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3
drivers/md/bcache/super.c
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@ -1373,6 +1373,9 @@ static void cache_set_flush(struct closure *cl)
struct btree *b; struct btree *b;
unsigned i; unsigned i;
if (!c)
closure_return(cl);
bch_cache_accounting_destroy(&c->accounting); bch_cache_accounting_destroy(&c->accounting);
kobject_put(&c->internal); kobject_put(&c->internal);