linux-kernel - [PATCH] ubifs: Fix ubifs_tnc_lookup() usage in do_kill

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Message-Id: <20200119215233.7292-1-richard@nod.at>
Date:   Sun, 19 Jan 2020 22:52:33 +0100
From:   Richard Weinberger <richard@....at>
To:     linux-mtd@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Richard Weinberger <richard@....at>
Subject: [PATCH] ubifs: Fix ubifs_tnc_lookup() usage in do_kill_orphans()

Orphans are allowed to point to deleted inodes.
So -ENOENT is not a fatal error.

Reported-by: Кочетков Максим <fido_max@...ox.ru>
Reported-and-tested-by: "Christian Berger" <Christian.Berger@...bosch.com>
Fixes: ee1438ce5dc4 ("ubifs: Check link count of inodes when killing orphans.")
Signed-off-by: Richard Weinberger <richard@....at>
---
 fs/ubifs/orphan.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ubifs/orphan.c b/fs/ubifs/orphan.c
index 54d6db61106f..2645917360b9 100644
--- a/fs/ubifs/orphan.c
+++ b/fs/ubifs/orphan.c
@@ -688,14 +688,14 @@ static int do_kill_orphans(struct ubifs_info *c, struct ubifs_scan_leb *sleb,
 
 			ino_key_init(c, &key1, inum);
 			err = ubifs_tnc_lookup(c, &key1, ino);
-			if (err)
+			if (err && err != -ENOENT)
 				goto out_free;
 
 			/*
 			 * Check whether an inode can really get deleted.
 			 * linkat() with O_TMPFILE allows rebirth of an inode.
 			 */
-			if (ino->nlink == 0) {
+			if (err == 0 && ino->nlink == 0) {
 				dbg_rcvry("deleting orphaned inode %lu",
 					  (unsigned long)inum);
 
-- 
2.16.4