linux-kernel - [PATCH 8/8] dlm: NULL dereference on failure in kmem_cache

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Message-Id: <1337635120-19969-9-git-send-email-teigland@redhat.com>
Date:	Mon, 21 May 2012 16:18:40 -0500
From:	David Teigland <teigland@...hat.com>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH 8/8] dlm: NULL dereference on failure in kmem_cache_create()

From: Dan Carpenter <dan.carpenter@...cle.com>

We aren't allowed to pass NULL pointers to kmem_cache_destroy() so if
both allocations fail, it leads to a NULL dereference.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: David Teigland <teigland@...hat.com>
---
 fs/dlm/memory.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/fs/dlm/memory.c b/fs/dlm/memory.c
index da64df7..7cd24bc 100644
--- a/fs/dlm/memory.c
+++ b/fs/dlm/memory.c
@@ -21,21 +21,19 @@ static struct kmem_cache *rsb_cache;
 
 int __init dlm_memory_init(void)
 {
-	int ret = 0;
-
 	lkb_cache = kmem_cache_create("dlm_lkb", sizeof(struct dlm_lkb),
 				__alignof__(struct dlm_lkb), 0, NULL);
 	if (!lkb_cache)
-		ret = -ENOMEM;
+		return -ENOMEM;
 
 	rsb_cache = kmem_cache_create("dlm_rsb", sizeof(struct dlm_rsb),
 				__alignof__(struct dlm_rsb), 0, NULL);
 	if (!rsb_cache) {
 		kmem_cache_destroy(lkb_cache);
-		ret = -ENOMEM;
+		return -ENOMEM;
 	}
 
-	return ret;
+	return 0;
 }
 
 void dlm_memory_exit(void)
-- 
1.7.10.1.362.g242cab3

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