linux-kernel - [PATCH] zsmalloc: fix a null pointer dereference in destroy_handle

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Date:	Fri,  5 Jun 2015 20:11:30 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: [PATCH] zsmalloc: fix a null pointer dereference in destroy_handle_cache()

zs_destroy_pool()->destroy_handle_cache() invoked from
zs_create_pool() can pass a NULL ->handle_cachep pointer
to kmem_cache_destroy(), which will dereference it.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
---
 mm/zsmalloc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 33d5126..c766240 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -285,7 +285,8 @@ static int create_handle_cache(struct zs_pool *pool)
 
 static void destroy_handle_cache(struct zs_pool *pool)
 {
-	kmem_cache_destroy(pool->handle_cachep);
+	if (pool->handle_cachep)
+		kmem_cache_destroy(pool->handle_cachep);
 }
 
 static unsigned long alloc_handle(struct zs_pool *pool)
-- 
2.4.2.387.gf86f31a

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