[PATCH 3.13.y-ckt 028/139] UBI: Fix double free after do_sync_erase()
From: Kamal Mostafa <hidden>
Date: 2015-01-29 03:05:07
Also in:
lkml
Subsystem:
memory technology devices (mtd), the rest, unsorted block images (ubi) · Maintainers:
Miquel Raynal, Richard Weinberger, Vignesh Raghavendra, Linus Torvalds
3.13.11-ckt15 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Richard Weinberger <richard@nod.at> 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: Kamal Mostafa <redacted> --- drivers/mtd/ubi/wl.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-)
diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index 02317c1..68b924e 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;
--
1.9.1