From: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Date: Fri, 10 May 2013 13:37:14 +0000 (+0100)
Subject: dm cache: fix error return code in cache_create
X-Git-Tag: v5.15~20112^2~19
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=fa4d683af3693863bec761e2761a07e4c1351f86;p=platform%2Fkernel%2Flinux-starfive.git

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>
---

diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 1074409..6feaba2 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -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) {