netdev - Re: Kernel 4.1.12 crash

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Message-ID: <20151203153536.GC16101@alphalink.fr>
Date:	Thu, 3 Dec 2015 16:35:37 +0100
From:	Guillaume Nault <g.nault@...halink.fr>
To:	Andrew <nitr0@...i.kr.ua>
Cc:	Alexander Duyck <alexander.duyck@...il.com>,
	netdev@...r.kernel.org, Simon Farnsworth <simon@...nz.org.uk>
Subject: Re: Kernel 4.1.12 crash

On Wed, Dec 02, 2015 at 06:23:35PM +0100, Guillaume Nault wrote:
> 
> You can try the following. It's not yet a proper fix as there are still
> a few things that bug me in pppoe_connect().
> 
> ---
> diff --git a/drivers/net/ppp/pppoe.c b/drivers/net/ppp/pppoe.c
> index 5e0b432..865b74d 100644
> --- a/drivers/net/ppp/pppoe.c
> +++ b/drivers/net/ppp/pppoe.c
> @@ -568,6 +568,9 @@ static int pppoe_create(struct net *net, struct socket *sock, int kern)
>  	sk->sk_family		= PF_PPPOX;
>  	sk->sk_protocol		= PX_PROTO_OE;
>  
> +	INIT_WORK(&pppox_sk(sk)->proto.pppoe.padt_work,
> +		  pppoe_unbind_sock_work);
> +
>  	return 0;
>  }
>  
> @@ -632,8 +635,6 @@ static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
>  
>  	lock_sock(sk);
>  
> -	INIT_WORK(&po->proto.pppoe.padt_work, pppoe_unbind_sock_work);
> -
>  	error = -EINVAL;
>  	if (sp->sa_protocol != PX_PROTO_OE)
>  		goto end;
> @@ -663,8 +664,6 @@ static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
>  			po->pppoe_dev = NULL;
>  		}
>  
> -		memset(sk_pppox(po) + 1, 0,
> -		       sizeof(struct pppox_sock) - sizeof(struct sock));
>  		sk->sk_state = PPPOX_NONE;
>  	}
>  
Finally, I'm going to send something similar to -net and keep the rest
of pppoe_connect() modifications for net-next. This will ease
backporting to -stable.
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