3.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Weinberger <richard@nod.at>

commit a29852be492d61001d86c6ebf5fff9b93d7b4be9 upstream.

Two bad things can happen in ubi_scan():
1. If kmem_cache_create() fails we jump to out_si and call
   ubi_scan_destroy_si() which calls kmem_cache_destroy().
   But si->scan_leb_slab is NULL.
2. If process_eb() fails we jump to out_vidh, call
   kmem_cache_destroy() and ubi_scan_destroy_si() which calls
   again kmem_cache_destroy().

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/mtd/ubi/scan.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/mtd/ubi/scan.c
+++ b/drivers/mtd/ubi/scan.c

@@ -1174,7 +1174,7 @@ struct ubi_scan_info *ubi_scan(struct ub
 
 	ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
 	if (!ech)
-		goto out_slab;
+		goto out_si;
 
 	vidh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
 	if (!vidh)

@@ -1235,8 +1235,6 @@ out_vidh:
 	ubi_free_vid_hdr(ubi, vidh);
 out_ech:
 	kfree(ech);
-out_slab:
-	kmem_cache_destroy(si->scan_leb_slab);
 out_si:
 	ubi_scan_destroy_si(si);
 	return ERR_PTR(err);

@@ -1325,7 +1323,9 @@ void ubi_scan_destroy_si(struct ubi_scan
 		}
 	}
 
-	kmem_cache_destroy(si->scan_leb_slab);
+	if (si->scan_leb_slab)
+		kmem_cache_destroy(si->scan_leb_slab);
+
 	kfree(si);
 }