Patch "xfs: Fix off-by-in in loop termination in xfs_find_get_desired_pgoff()" has been added to the 4.11-stable tree

Patch "xfs: Fix off-by-in in loop termination in xfs_find_get_desired_pgoff()" has been added to the 4.11-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    xfs: Fix off-by-in in loop termination in xfs_find_get_desired_pgoff()

to the 4.11-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     xfs-fix-off-by-in-in-loop-termination-in-xfs_find_get_desired_pgoff.patch
and it can be found in the queue-4.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From d7fd24257aa60316bf81093f7f909dc9475ae974 Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@suse.cz>
Date: Thu, 18 May 2017 16:36:23 -0700
Subject: xfs: Fix off-by-in in loop termination in xfs_find_get_desired_pgoff()

From: Jan Kara <jack@suse.cz>

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>

---
 fs/xfs/xfs_file.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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;


Patches currently in stable-queue which might be from jack@suse.cz are

queue-4.11/xfs-fix-missed-holes-in-seek_hole-implementation.patch
queue-4.11/mm-avoid-spurious-bad-pmd-warning-messages.patch
queue-4.11/xfs-fix-off-by-one-on-max-nr_pages-in-xfs_find_get_desired_pgoff.patch
queue-4.11/dax-fix-race-between-colliding-pmd-pte-entries.patch
queue-4.11/xfs-fix-off-by-in-in-loop-termination-in-xfs_find_get_desired_pgoff.patch