linux-kernel - [PATCH 5.6 001/106] ubifs: Fix ubifs_tnc_lookup() usage in do_kill

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Message-Id: <20200501131543.592652133@linuxfoundation.org>
Date:   Fri,  1 May 2020 15:22:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Кочетков Максим 
        <fido_max@...ox.ru>, Karl Olsen <karl@...ro-technic.com>,
        Jef Driesen <jef.driesen@...o.eu>,
        Richard Weinberger <richard@....at>,
        Christian Eggers <ceggers@...i.de>,
        "Christian Berger" <Christian.Berger@...bosch.com>
Subject: [PATCH 5.6 001/106] ubifs: Fix ubifs_tnc_lookup() usage in do_kill_orphans()

From: Richard Weinberger <richard@....at>

commit 4ab25ac8b2b5514151d5f91cf9514df08dd26938 upstream.

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>
Tested-by: Karl Olsen <karl@...ro-technic.com>
Tested-by: Jef Driesen <jef.driesen@...o.eu>
Fixes: ee1438ce5dc4 ("ubifs: Check link count of inodes when killing orphans.")
Signed-off-by: Richard Weinberger <richard@....at>
Cc: Christian Eggers <ceggers@...i.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ubifs/orphan.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/ubifs/orphan.c
+++ b/fs/ubifs/orphan.c
@@ -688,14 +688,14 @@ static int do_kill_orphans(struct ubifs_
 
 			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);