block: pass inclusive 'lend' parameter to truncate_inode_pages_range

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: <stable@vger.kernel.org>
Cc: Dmitry Monakhov <dmonakhov@openvz.org>
Fixes: 351499a172c0 ("block: Invalidate cache on discard v2")
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/ioctl.c b/block/ioctl.c
index 1668506d8ed80607b6e3c279fa22195fb73571de..3884d810efd27fc73bb07659b91296ea46265252 100644 (file)
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -225,7 +225,7 @@ static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
 
        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);
 }