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.

Fixes: 351499a172c0 ("block: Invalidate cache on discard v2")
Signed-off-by: Ming Lei <ming....@redhat.com>
---
 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);
 }
-- 
2.9.5

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