linux-kernel - [PATCH 4.9 001/271] xfs: Sanity check flags of Q

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Message-Id: <20200128135852.546610656@linuxfoundation.org>
Date:   Tue, 28 Jan 2020 15:02:30 +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, Yang Xu <xuyang2018.jy@...fujitsu.com>,
        Jan Kara <jack@...e.cz>, Eric Sandeen <sandeen@...hat.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>
Subject: [PATCH 4.9 001/271] xfs: Sanity check flags of Q_XQUOTARM call

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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/xfs/xfs_quotaops.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/fs/xfs/xfs_quotaops.c
+++ b/fs/xfs/xfs_quotaops.c
@@ -214,6 +214,9 @@ 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)