UBI: fix kmem_cache_free on error patch
'kmem_cache_free()' oopeses if NULL is passed, and there is
one error-path place where UBI may call it with NULL object.
This problem was pointed to by Adrian Hunter.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index f25ae29..acb5520 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -826,7 +826,8 @@
err = schedule_erase(ubi, e1, 0);
if (err) {
kmem_cache_free(ubi_wl_entry_slab, e1);
- kmem_cache_free(ubi_wl_entry_slab, e2);
+ if (e2)
+ kmem_cache_free(ubi_wl_entry_slab, e2);
goto out_ro;
}