4.15-stable review patch.  If anyone has any objections, please let me know.


From: Ming Lei <ming....@redhat.com>

commit 0bd1ed4860d0f5f836aa8371797689a3779d1bf5 upstream.

The 'lend' parameter of truncate_inode_pages_range is required to be
inclusive, so follow the rule.

This patch fixes one memory corruption triggered by discard.

Cc: <sta...@vger.kernel.org>
Cc: Dmitry Monakhov <dmonak...@openvz.org>
Fixes: 351499a172c0 ("block: Invalidate cache on discard v2")
Reviewed-by: Bart Van Assche <bart.vanass...@wdc.com>
Signed-off-by: Ming Lei <ming....@redhat.com>
Signed-off-by: Jens Axboe <ax...@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

 block/ioctl.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -225,7 +225,7 @@ static int blk_ioctl_discard(struct bloc
        if (start + len > i_size_read(bdev->bd_inode))
                return -EINVAL;
-       truncate_inode_pages_range(mapping, start, start + len);
+       truncate_inode_pages_range(mapping, start, start + len - 1);
        return blkdev_issue_discard(bdev, start >> 9, len >> 9,
                                    GFP_KERNEL, flags);

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