On Jan 10, 2016, at 11:25 PM, Fan Li <fanofcode.li@xxxxxxxxxxx> wrote:
>
> __generic_block_fiemap() looks up extents within isize, so original
> function truncate len to isize if len >= isize, but when start > 0,
> start + len would still be greater than isize.
> Update len properly in this patch.
>
> Signed-off-by: Fan Li <fanofcode.li@xxxxxxxxxxx>
> ---
> fs/ioctl.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/fs/ioctl.c b/fs/ioctl.c
> index 41c352e..13a3e96 100644
> --- a/fs/ioctl.c
> +++ b/fs/ioctl.c
> @@ -268,9 +268,12 @@ int __generic_block_fiemap(struct inode *inode,
> * since we expect isize to not change at all through the duration of
> * this call.
> */
> - if (len >= isize) {
> + if (start >= isize)
> + return 0;
> +
> + if (start + len > isize) {
> whole_file = true;
> - len = isize;
> + len = isize - start;
> }
>
> /*
Reviewed-by: Andreas Dilger <adilger@xxxxxxxxx>
Cheers, Andreas
Attachment:
signature.asc
Description: Message signed with OpenPGP using GPGMail
