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authorTomas Racek <tracek@redhat.com>2012-08-14 10:35:04 +0200
committerBen Myers <bpm@sgi.com>2012-08-23 14:48:44 -0500
commita672e1be30d5bc848cd0067c55ed29b2015b7c17 (patch)
treecabdd7348997ae1d7a478a5c699eb0a954a1ed7d /fs/xfs/xfs_discard.c
parent761290309939743ddf97e2bd94c6da18c6436b79 (diff)
downloadop-kernel-dev-a672e1be30d5bc848cd0067c55ed29b2015b7c17.zip
op-kernel-dev-a672e1be30d5bc848cd0067c55ed29b2015b7c17.tar.gz
xfs: check for possible overflow in xfs_ioc_trim
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> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_discard.c')
-rw-r--r--fs/xfs/xfs_discard.c6
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;
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