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dm cache: fix error return code in cache_create 

Return -ENOMEM if memory allocation fails in cache_create
instead of 0 (to avoid NULL pointer dereference).

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Cc: stable@vger.kernel.org
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Wei Yongjun 2013-05-10 14:37:14 +01:00 committed by Alasdair G Kergon
parent d793e68427
commit fa4d683af3
1 changed files with 1 additions and 0 deletions
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1
drivers/md/dm-cache-target.c
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@ -1971,6 +1971,7 @@ static int cache_create(struct cache_args *ca, struct cache **result)
atomic_set(&cache->nr_migrations, 0);
init_waitqueue_head(&cache->migration_wait);
r = -ENOMEM;
cache->nr_dirty = 0;
cache->dirty_bitset = alloc_bitset(from_cblock(cache->cache_size));
if (!cache->dirty_bitset) {