Messages in this thread Patch in this message | | | From | Jiri Slaby <> | Subject | [PATCH 3.12 018/176] UBI: Fix double free after do_sync_erase() | Date | Wed, 28 Jan 2015 15:27:28 +0100 |
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From: Richard Weinberger <richard@nod.at>
3.12-stable review patch. If anyone has any objections, please let me know.
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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: Jiri Slaby <jslaby@suse.cz> --- 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 c95bfb183c62..49e570abe58b 100644 --- a/drivers/mtd/ubi/wl.c +++ b/drivers/mtd/ubi/wl.c @@ -1209,7 +1209,6 @@ 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; @@ -1223,10 +1222,8 @@ 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"); @@ -1262,10 +1259,9 @@ 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; -- 2.2.2
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