linux-kernel - [PATCH AUTOSEL 4.4 06/10] xfs: initialize the shortform attr header padding entry

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Message-Id: <20200907163543.1281889-6-sashal@kernel.org>
Date:   Mon,  7 Sep 2020 12:35:39 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     "Darrick J. Wong" <darrick.wong@...cle.com>,
        Eric Sandeen <sandeen@...hat.com>,
        Dave Chinner <dchinner@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Sasha Levin <sashal@...nel.org>, linux-xfs@...r.kernel.org
Subject: [PATCH AUTOSEL 4.4 06/10] xfs: initialize the shortform attr header padding entry

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

[ Upstream commit 125eac243806e021f33a1fdea3687eccbb9f7636 ]

Don't leak kernel memory contents into the shortform attr fork.

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
Reviewed-by: Eric Sandeen <sandeen@...hat.com>
Reviewed-by: Dave Chinner <dchinner@...hat.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/xfs/libxfs/xfs_attr_leaf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c
index 445a3f2f871fb..da8747b870df3 100644
--- a/fs/xfs/libxfs/xfs_attr_leaf.c
+++ b/fs/xfs/libxfs/xfs_attr_leaf.c
@@ -514,8 +514,8 @@ xfs_attr_shortform_create(xfs_da_args_t *args)
 		ASSERT(ifp->if_flags & XFS_IFINLINE);
 	}
 	xfs_idata_realloc(dp, sizeof(*hdr), XFS_ATTR_FORK);
-	hdr = (xfs_attr_sf_hdr_t *)ifp->if_u1.if_data;
-	hdr->count = 0;
+	hdr = (struct xfs_attr_sf_hdr *)ifp->if_u1.if_data;
+	memset(hdr, 0, sizeof(*hdr));
 	hdr->totsize = cpu_to_be16(sizeof(*hdr));
 	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
 }
-- 
2.25.1