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")
Signed-off-by: Ming Lei <ming....@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);
}
--
2.9.5
