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Date:	Mon, 14 Dec 2015 14:58:09 -0800
From:	Cong Wang <cwang@...pensource.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net] pptp: validate sockaddr_len before binding

On Mon, Dec 14, 2015 at 2:45 PM, Hannes Frederic Sowa
<hannes@...essinduktion.org> wrote:
> diff --git a/drivers/net/ppp/pptp.c b/drivers/net/ppp/pptp.c
> index fc69e41d09506e..f9ffdf070ad807 100644
> --- a/drivers/net/ppp/pptp.c
> +++ b/drivers/net/ppp/pptp.c
> @@ -419,6 +419,9 @@ static int pptp_bind(struct socket *sock, struct sockaddr *uservaddr,
>         struct pptp_opt *opt = &po->proto.pptp;
>         int error = 0;
>
> +       if (sockaddr_len < sizeof(*sp))
> +               return -EINVAL;
> +

I sent a very similar patch:
https://patchwork.ozlabs.org/patch/556663/
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