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authorKulikov Vasiliy <segooon@gmail.com>2010-07-20 17:54:28 +1000
committerAlex Elder <aelder@sgi.com>2010-07-26 13:16:50 -0500
commit3f34885cd7c6a3f4deea48e3bbc704d91d5704f4 (patch)
treec03bcdaf42d70d7e08df2cd629d5308870660bed /fs/xfs
parentaea1b9532143218f8599ecedbbd6bfbf812385e1 (diff)
xfs: fix unsigned underflow in xfs_free_eofblocks
map_len is unsigned. Checking map_len <= 0 is buggy when it should be below zero. So, check exact expression instead of map_len. Signed-off-by: Kulikov Vasiliy <segooon@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_vnodeops.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index 9865e1136017..3ac137dd531b 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -589,9 +589,9 @@ xfs_free_eofblocks(
*/
end_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)ip->i_size));
last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
- map_len = last_fsb - end_fsb;
- if (map_len <= 0)
+ if (last_fsb <= end_fsb)
return 0;
+ map_len = last_fsb - end_fsb;
nimaps = 1;
xfs_ilock(ip, XFS_ILOCK_SHARED);