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UBI: Fix double free after do_sync_erase()

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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.

Cc: <stable@vger.kernel.org>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
This commit is contained in:
Richard Weinberger 2014-11-06 16:47:49 +01:00 committed by Artem Bityutskiy
parent a76284e6f8
commit aa5ad3b6eb
1 changed files with 3 additions and 7 deletions
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10
drivers/mtd/ubi/wl.c
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@ -1216,7 +1216,6 @@ 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;
@ -1230,10 +1229,8 @@ 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");
@ -1269,10 +1266,9 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
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;