From: Jan Kara Date: Thu, 18 May 2017 23:36:23 +0000 (-0700) Subject: xfs: Fix off-by-in in loop termination in xfs_find_get_desired_pgoff() X-Git-Tag: v4.12-rc3~14^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d7fd24257aa60316bf81093f7f909dc9475ae974;p=platform%2Fkernel%2Flinux-exynos.git xfs: Fix off-by-in in loop termination in xfs_find_get_desired_pgoff() There is an off-by-one error in loop termination conditions in xfs_find_get_desired_pgoff() since 'end' may index a page beyond end of desired range if 'endoff' is page aligned. It doesn't have any visible effects but still it is good to fix it. Signed-off-by: Jan Kara Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong --- diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index f1517e9..dc0e4cb 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -1043,7 +1043,7 @@ xfs_find_get_desired_pgoff( index = startoff >> PAGE_SHIFT; endoff = XFS_FSB_TO_B(mp, map->br_startoff + map->br_blockcount); - end = endoff >> PAGE_SHIFT; + end = (endoff - 1) >> PAGE_SHIFT; do { int want; unsigned nr_pages;