linux-kernel - [PATCH 4.19 60/91] xfs: strengthen rmap record flags checking

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Date:   Mon, 23 Nov 2020 13:22:20 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Chandan Babu R <chandanrlinux@...il.com>,
        Christoph Hellwig <hch@....de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 60/91] xfs: strengthen rmap record flags checking

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

[ Upstream commit 498fe261f0d6d5189f8e11d283705dd97b474b54 ]

We always know the correct state of the rmap record flags (attr, bmbt,
unwritten) so check them by direct comparison.

Fixes: d852657ccfc0 ("xfs: cross-reference reverse-mapping btree")
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
Reviewed-by: Chandan Babu R <chandanrlinux@...il.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/xfs/scrub/bmap.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/xfs/scrub/bmap.c b/fs/xfs/scrub/bmap.c
index b05d65fd360b3..cf005e18d6186 100644
--- a/fs/xfs/scrub/bmap.c
+++ b/fs/xfs/scrub/bmap.c
@@ -225,13 +225,13 @@ xchk_bmap_xref_rmap(
 	 * which doesn't track unwritten state.
 	 */
 	if (owner != XFS_RMAP_OWN_COW &&
-	    irec->br_state == XFS_EXT_UNWRITTEN &&
-	    !(rmap.rm_flags & XFS_RMAP_UNWRITTEN))
+	    !!(irec->br_state == XFS_EXT_UNWRITTEN) !=
+	    !!(rmap.rm_flags & XFS_RMAP_UNWRITTEN))
 		xchk_fblock_xref_set_corrupt(info->sc, info->whichfork,
 				irec->br_startoff);
 
-	if (info->whichfork == XFS_ATTR_FORK &&
-	    !(rmap.rm_flags & XFS_RMAP_ATTR_FORK))
+	if (!!(info->whichfork == XFS_ATTR_FORK) !=
+	    !!(rmap.rm_flags & XFS_RMAP_ATTR_FORK))
 		xchk_fblock_xref_set_corrupt(info->sc, info->whichfork,
 				irec->br_startoff);
 	if (rmap.rm_flags & XFS_RMAP_BMBT_BLOCK)
-- 
2.27.0