linux-kernel - [PATCH 1/1] xfs: check for possible overflow in xfs_ioc

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Date:	Mon, 30 Jul 2012 10:13:44 +0200
From:	Tomas Racek <tracek@...hat.com>
To:	linux-xfs@...r.kernel.org
Cc:	lczerner@...hat.com, Tomas Racek <tracek@...hat.com>,
	Ben Myers <bpm@....com> (supporter:XFS FILESYSTEM),
	Alex Elder <elder@...nel.org> (supporter:XFS FILESYSTEM),
	xfs@....sgi.com (supporter:XFS FILESYSTEM),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 1/1] xfs: check for possible overflow in xfs_ioc_trim

If range.start argument was between ULLONG_MAX - BBSIZE and ULLONG_MAX,
BTOBB macro resulted in overflow which caused start to be set to 0.
Now, invalid argument error is returned instead.

Signed-off-by: Tomas Racek <tracek@...hat.com>
---
 fs/xfs/xfs_discard.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/xfs/xfs_discard.c b/fs/xfs/xfs_discard.c
index f9c3fe3..0ef7dd4 100644
--- a/fs/xfs/xfs_discard.c
+++ b/fs/xfs/xfs_discard.c
@@ -179,6 +179,10 @@ 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 > ULLONG_MAX - BBSIZE)
+		return -XFS_ERROR(EINVAL);
+
 	start = BTOBB(range.start);
 	end = start + BTOBBT(range.len) - 1;
 	minlen = BTOBB(max_t(u64, granularity, range.minlen));
-- 
1.7.7.6

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