linux-kernel - [PATCH 4.17 58/67] xfs: fix inobt magic number check

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Message-Id: <20180716073452.939919041@linuxfoundation.org>
Date:   Mon, 16 Jul 2018 09:35:27 +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,
        syzbot+08ab33be0178b76851c8@...kaller.appspotmail.com,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Eric Sandeen <sandeen@...hat.com>
Subject: [PATCH 4.17 58/67] xfs: fix inobt magic number check

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Darrick J. Wong <darrick.wong@...cle.com>

commit 2e050e648ad6c74a2f0a28f645155128be0626ca upstream.

In commit a6a781a58befcbd467c ("xfs: have buffer verifier functions
report failing address") the bad magic number return was ported
incorrectly.

Fixes: a6a781a58befcbd467ce843af4eaca3906aa1f08
Reported-by: syzbot+08ab33be0178b76851c8@...kaller.appspotmail.com
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
Reviewed-by: Eric Sandeen <sandeen@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/xfs/libxfs/xfs_ialloc_btree.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/xfs/libxfs/xfs_ialloc_btree.c
+++ b/fs/xfs/libxfs/xfs_ialloc_btree.c
@@ -296,7 +296,7 @@ xfs_inobt_verify(
 	case cpu_to_be32(XFS_FIBT_MAGIC):
 		break;
 	default:
-		return NULL;
+		return __this_address;
 	}

 	/* level verification */