提交 aa5ad3b6 编写于 作者: R Richard Weinberger 提交者: Artem Bityutskiy

UBI: Fix double free after do_sync_erase()

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: NRichard Weinberger <richard@nod.at>
Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
上级 a76284e6
......@@ -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;
......
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