On Sat, Feb 10, 2018 at 8:46 AM, Ming Lei ming.lei@redhat.com wrote:

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);
  

}

2.9.5

Hi Jens,

Could you consider it in v4.16 since it does fix a regression in lkp test?

Thanks, Ming Lei