linux-kernel - [PATCH][next] xfs: fix zero'ing of ILOG owner bits by using correct bitwise operator

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Date:   Tue, 27 Mar 2018 15:40:01 +0100
From:   Colin King <colin.king@...onical.com>
To:     "Darrick J . Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] xfs: fix zero'ing of ILOG owner bits by using correct bitwise operator

From: Colin Ian King <colin.king@...onical.com>

Currently the masking of the ili_fields is using the ! operator which
results in masking with 0, which clears all the bits which is not
intended.  Instead, use the ~ operator that negates the inverts the
bits to correctly mask out the XFS_ILOG_AOWNER and XFS_ILOG_DOWNER
bits.

Detected by CoverityScan, CID#1466877 ("Logical vs bitwise operator")

Fixes: 3fdf96830762 ("xfs: do not log swapext extent owner changes for deleted")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 fs/xfs/xfs_inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index a16f48fde4da..3e3aab3888fa 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -2477,7 +2477,7 @@ xfs_ifree(
 	ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
 
 	/* Don't attempt to replay owner changes for a deleted inode */
-	ip->i_itemp->ili_fields &= !(XFS_ILOG_AOWNER|XFS_ILOG_DOWNER);
+	ip->i_itemp->ili_fields &= ~(XFS_ILOG_AOWNER|XFS_ILOG_DOWNER);
 
 	/*
 	 * Bump the generation count so no one will be confused
-- 
2.15.1