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bcache: fix cache_set_flush() NULL pointer dereference on OOM 

commit f8b11260a445169989d01df75d35af0f56178f95 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Eric Wheeler 2016-03-07 15:17:50 -08:00 committed by Willy Tarreau
parent 7493d12872
commit f5b0d85307
1 changed files with 3 additions and 0 deletions
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3
drivers/md/bcache/super.c
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@ -1295,6 +1295,9 @@ static void cache_set_flush(struct closure *cl)
set_bit(CACHE_SET_STOPPING_2, &c->flags);
wake_up(&c->alloc_wait);
if (!c)
closure_return(cl);
bch_cache_accounting_destroy(&c->accounting);
kobject_put(&c->internal);