[PATCH v4] xfs: check for possible overflow in xfs_ioc_trim

From: Tomas Racek <tracek@redhat.com>
To: xfs@oss.sgi.com
Cc: lczerner@redhat.com, Tomas Racek <tracek@redhat.com>
Subject: [PATCH v4] xfs: check for possible overflow in xfs_ioc_trim
Date: Tue, 14 Aug 2012 10:35:04 +0200	[thread overview]
Message-ID: <1344933304-16014-1-git-send-email-tracek@redhat.com> (raw)

If range.start or range.minlen is bigger than filesystem size, return
invalid value error. This fixes possible overflow in BTOBB macro when
passed value was nearly ULLONG_MAX.

Signed-off-by: Tomas Racek <tracek@redhat.com>
---
 fs/xfs/xfs_discard.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/xfs_discard.c b/fs/xfs/xfs_discard.c
index f9c3fe3..69cf4fc 100644
--- a/fs/xfs/xfs_discard.c
+++ b/fs/xfs/xfs_discard.c
@@ -179,12 +179,14 @@ xfs_ioc_trim(
 	 * used by the fstrim application.  In the end it really doesn't
 	 * matter as trimming blocks is an advisory interface.
 	 */
+	if (range.start >= XFS_FSB_TO_B(mp, mp->m_sb.sb_dblocks) ||
+	    range.minlen > XFS_FSB_TO_B(mp, XFS_ALLOC_AG_MAX_USABLE(mp)))
+		return -XFS_ERROR(EINVAL);
+
 	start = BTOBB(range.start);
 	end = start + BTOBBT(range.len) - 1;
 	minlen = BTOBB(max_t(u64, granularity, range.minlen));
 
-	if (XFS_BB_TO_FSB(mp, start) >= mp->m_sb.sb_dblocks)
-		return -XFS_ERROR(EINVAL);
 	if (end > XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks) - 1)
 		end = XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)- 1;
 
-- 
1.7.7.6

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