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    Subject[PATCH 4.15 031/122] block: pass inclusive lend parameter to truncate_inode_pages_range
    Date
    4.15-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Ming Lei <ming.lei@redhat.com>

    commit 0bd1ed4860d0f5f836aa8371797689a3779d1bf5 upstream.

    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>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    block/ioctl.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/block/ioctl.c
    +++ b/block/ioctl.c
    @@ -225,7 +225,7 @@ static int blk_ioctl_discard(struct bloc

    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);
    }

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