From: Richard Weinberger <richard@nod.at>
Date: Thu, 6 Nov 2014 15:47:49 +0000 (+0100)
Subject: UBI: Fix double free after do_sync_erase()
X-Git-Tag: v3.14.29~53
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e69001acba6725963d0bc5476ec380f56bd65932;p=platform%2Fkernel%2Flinux-stable.git

UBI: Fix double free after do_sync_erase()

commit aa5ad3b6eb8feb2399a5d26c8fb0060561bb9534 upstream.

If the erase worker is unable to erase a PEB it will
free the ubi_wl_entry itself.
The failing ubi_wl_entry must not free()'d again after
do_sync_erase() returns.

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>
---

diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index 02317c1c0238..68b924ec222e 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -1205,7 +1205,6 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
 
 	err = do_sync_erase(ubi, e1, vol_id, lnum, 0);
 	if (err) {
-		kmem_cache_free(ubi_wl_entry_slab, e1);
 		if (e2)
 			kmem_cache_free(ubi_wl_entry_slab, e2);
 		goto out_ro;
@@ -1219,10 +1218,8 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
 		dbg_wl("PEB %d (LEB %d:%d) was put meanwhile, erase",
 		       e2->pnum, vol_id, lnum);
 		err = do_sync_erase(ubi, e2, vol_id, lnum, 0);
-		if (err) {
-			kmem_cache_free(ubi_wl_entry_slab, e2);
+		if (err)
 			goto out_ro;
-		}
 	}
 
 	dbg_wl("done");
@@ -1258,10 +1255,9 @@ out_not_moved:
 
 	ubi_free_vid_hdr(ubi, vid_hdr);
 	err = do_sync_erase(ubi, e2, vol_id, lnum, torture);
-	if (err) {
-		kmem_cache_free(ubi_wl_entry_slab, e2);
+	if (err)
 		goto out_ro;
-	}
+
 	mutex_unlock(&ubi->move_mutex);
 	return 0;