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authorEric Wheeler <git@linux.ewheeler.net>2016-03-07 23:17:50 (GMT)
committerJens Axboe <axboe@fb.com>2016-03-08 16:19:10 (GMT)
commitf8b11260a445169989d01df75d35af0f56178f95 (patch)
tree39c76fd608151d09474df9654b14367855808e7b /drivers/md/bcache
parent9b299728ed777428b3908ac72ace5f8f84b97789 (diff)
downloadlinux-f8b11260a445169989d01df75d35af0f56178f95.tar.xz
bcache: fix cache_set_flush() NULL pointer dereference on OOM
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
Diffstat (limited to 'drivers/md/bcache')
-rw-r--r--drivers/md/bcache/super.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 6b07a0c..a296425 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1373,6 +1373,9 @@ static void cache_set_flush(struct closure *cl)
struct btree *b;
unsigned i;
+ if (!c)
+ closure_return(cl);
+
bch_cache_accounting_destroy(&c->accounting);
kobject_put(&c->internal);