linux-kernel - [PATCH -next 1/2] Revert "ubifs: dirty_cow_znode: Fix memleak in error handling path"

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Message-ID: <20230301122919.266818-2-chengzhihao1@huawei.com>
Date:   Wed, 1 Mar 2023 20:29:18 +0800
From:   Zhihao Cheng <chengzhihao1@...wei.com>
To:     <richard@....at>, <s.hauer@...gutronix.de>,
        <miquel.raynal@...tlin.com>
CC:     <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <chengzhihao1@...wei.com>
Subject: [PATCH -next 1/2] Revert "ubifs: dirty_cow_znode: Fix memleak in error handling path"

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)
Signed-off-by: Zhihao Cheng <chengzhihao1@...wei.com>
---
 fs/ubifs/tnc.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/fs/ubifs/tnc.c b/fs/ubifs/tnc.c
index 2469f72eeaab..2df56bbc6865 100644
--- a/fs/ubifs/tnc.c
+++ b/fs/ubifs/tnc.c
@@ -267,18 +267,11 @@ static struct ubifs_znode *dirty_cow_znode(struct ubifs_info *c,
 	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;
-- 
2.31.1