From: shengyong <shengyong1@huawei.com>
Date: Thu, 25 Jun 2015 02:23:13 +0000 (+0000)
Subject: mtd: nandsim: fix free of NULL pointer
X-Git-Tag: firefly_0821_release~176^2~766^2~218
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ec7478fa173f65e5ee5fd2ba42c59ca3e700027b;p=firefly-linux-kernel-4.4.55.git

mtd: nandsim: fix free of NULL pointer

If allocating ns->nand_pages_slab fails, do not try to destroy it when
cleaning up nandsim resources.

Signed-off-by: Sheng Yong <shengyong1@huawei.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
---

diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
index 52c0c1a3899c..6a74f62a0033 100644
--- a/drivers/mtd/nand/nandsim.c
+++ b/drivers/mtd/nand/nandsim.c
@@ -649,7 +649,8 @@ static void free_device(struct nandsim *ns)
 				kmem_cache_free(ns->nand_pages_slab,
 						ns->pages[i].byte);
 		}
-		kmem_cache_destroy(ns->nand_pages_slab);
+		if (ns->nand_pages_slab)
+			kmem_cache_destroy(ns->nand_pages_slab);
 		vfree(ns->pages);
 	}
 }