netdev - Re: [PATCH net-next v4 1/3] net: ipv6: Unduplicate {raw,udp}v6

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Date:	Thu, 24 Apr 2014 17:00:19 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Lorenzo Colitti <lorenzo@...gle.com>
Cc:	netdev@...r.kernel.org, yoshfuji@...ux-ipv6.org,
	davem@...emloft.net, eric.dumazet@...il.com
Subject: Re: [PATCH net-next v4 1/3] net: ipv6: Unduplicate {raw,udp}v6_sendmsg code

On Wed, Apr 23, 2014 at 03:37:56PM +0900, Lorenzo Colitti wrote:
>  	if (msg->msg_flags&MSG_CONFIRM)
>  		goto do_confirm;
> @@ -1262,8 +1164,6 @@ back_from_confirm:
>  	up->pending = AF_INET6;
>  
>  do_append_data:
> -	if (dontfrag < 0)
> -		dontfrag = np->dontfrag;

I am afraid we could jump to do_append_data without having dontfrag
initialized. The jump happens before we call to ip6_datagram_send_common.

So the initialization of dontfrag to -1 needs to be added to the caller.

>  	up->len += ulen;
>  	getfrag  =  is_udplite ?  udplite_getfrag : ip_generic_getfrag;
>  	err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,

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