From: Zhihao Cheng chengzhihao1@huawei.com
commit 7d01cb27f6aebc54efbe28d8961a973b8f795b13 upstream.
This reverts commit 122deabfe1428 (ubifs: dirty_cow_znode: Fix memleak in error handling path). After commit 122deabfe1428 applied, if insert_old_idx() failed, old index neither exists in TNC nor in old-index tree. Which means that old index node could be overwritten in layout_leb_in_gaps(), then ubifs image will be corrupted in power-cut.
Fixes: 122deabfe1428 (ubifs: dirty_cow_znode: Fix memleak ... path) Cc: stable@vger.kernel.org Signed-off-by: Zhihao Cheng chengzhihao1@huawei.com Signed-off-by: Richard Weinberger richard@nod.at Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/ubifs/tnc.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-)
--- a/fs/ubifs/tnc.c +++ b/fs/ubifs/tnc.c @@ -279,18 +279,11 @@ static struct ubifs_znode *dirty_cow_zno if (zbr->len) { err = insert_old_idx(c, zbr->lnum, zbr->offs); if (unlikely(err)) - /* - * Obsolete znodes will be freed by tnc_destroy_cnext() - * or free_obsolete_znodes(), copied up znodes should - * be added back to tnc and freed by - * ubifs_destroy_tnc_subtree(). - */ - goto out; + return ERR_PTR(err); err = add_idx_dirt(c, zbr->lnum, zbr->len); } else err = 0;
-out: zbr->znode = zn; zbr->lnum = 0; zbr->offs = 0;