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authorJan Kara <jack@suse.cz>2017-05-18 16:36:23 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-06-07 12:10:17 +0200
commitb5ff97c77487869355fb6eafe79882e6e55ed498 (patch)
tree462ebc20a8430a3fa2e6da69fd7875721d3977c5
parentd514c634a4f267b98463b43bf091fb764afbadf7 (diff)
xfs: Fix off-by-in in loop termination in xfs_find_get_desired_pgoff()
commit d7fd24257aa60316bf81093f7f909dc9475ae974 upstream. 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 <jack@suse.cz> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/xfs/xfs_file.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index f1517e9928c7..dc0e4cb7029b 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;