linux-kernel - [PATCH 3.16 034/148] xfs: Sanity check flags of Q

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Message-ID: <lsq.1581185940.841782982@decadent.org.uk>
Date:   Sat, 08 Feb 2020 18:19:33 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Yang Xu" <xuyang2018.jy@...fujitsu.com>,
        "Eric Sandeen" <sandeen@...hat.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        "Jan Kara" <jack@...e.cz>
Subject: [PATCH 3.16 034/148] xfs: Sanity check flags of Q_XQUOTARM call

3.16.82-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Jan Kara <jack@...e.cz>

commit 3dd4d40b420846dd35869ccc8f8627feef2cff32 upstream.

Flags passed to Q_XQUOTARM were not sanity checked for invalid values.
Fix that.

Fixes: 9da93f9b7cdf ("xfs: fix Q_XQUOTARM ioctl")
Reported-by: Yang Xu <xuyang2018.jy@...fujitsu.com>
Signed-off-by: Jan Kara <jack@...e.cz>
Reviewed-by: Eric Sandeen <sandeen@...hat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/xfs/xfs_quotaops.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/fs/xfs/xfs_quotaops.c
+++ b/fs/xfs/xfs_quotaops.c
@@ -119,6 +119,9 @@ xfs_fs_rm_xquota(
 	if (XFS_IS_QUOTA_ON(mp))
 		return -EINVAL;
 
+	if (uflags & ~(FS_USER_QUOTA | FS_GROUP_QUOTA | FS_PROJ_QUOTA))
+		return -EINVAL;
+
 	if (uflags & FS_USER_QUOTA)
 		flags |= XFS_DQ_USER;
 	if (uflags & FS_GROUP_QUOTA)