On Thu, Aug 15, 2013 at 03:52:57PM +0300, Dan Carpenter wrote:
> The recent fix d9bf5f1309 "tun: compare with 0 instead of total_len" is
> not totally correct. Because "len" and "sizeof()" are size_t type, that
> means they are never less than zero.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
>
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index af987f0..7ed13cc 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -977,8 +977,9 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
> u32 rxhash;
>
> if (!(tun->flags & TUN_NO_PI)) {
> - if ((len -= sizeof(pi)) < 0)
> + if (len < sizeof(pi))
> return -EINVAL;
> + len -= sizeof(pi);
>
> if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi)))
> return -EFAULT;
> @@ -986,8 +987,9 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
> }
>
> if (tun->flags & TUN_VNET_HDR) {
> - if ((len -= tun->vnet_hdr_sz) < 0)
> + if (len < tun->vnet_hdr_sz)
> return -EINVAL;
> + len -= tun->vnet_hdr_sz;
>
> if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso)))
> return -EFAULT;
>
Acked-by: Neil Horman <nhorman@xxxxxxxxxxxxx>
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