On Wed, Dec 8, 2021 at 6:33 PM Dan Carpenter <dan.carpenter@xxxxxxxxxx> wrote:
>
> In this function "c->off" is a u32 and "size" is a long. On 64bit systems
> if "c->off" is greater than "size" then "size - c->off" is a negative and
> we always return -E2BIG. But on 32bit systems the subtraction is type
> promoted to a high positive u32 value and basically any "c->len" is
> accepted.
>
> Fixes: 4c8cf31885f6 ("vhost: introduce vDPA-based backend")
> Reported-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx>
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Reviewed-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx>
