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") Signed-off-by: Ming Lei ming.lei@redhat.com --- V2: - Cc stable list and Dmitry as suggested by Bart
block/ioctl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/ioctl.c b/block/ioctl.c index 1668506d8ed8..3884d810efd2 100644 --- 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); }