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>

1 files changed, 2 insertions, 1 deletions

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);
         }
 }