netdev - Re: [PATCH 1/2] Phonet: Implement Pipe Controller to support Nokia Slim Modems

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Date:	Fri, 24 Sep 2010 19:50:55 +0530
From:	Kumar SANGHVI <kumar.sanghvi@...ricsson.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"remi.denis-courmont@...ia.com" <remi.denis-courmont@...ia.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	STEricsson_nomadik_linux <STEricsson_nomadik_linux@...t.st.com>,
	Sudeep DIVAKARAN <sudeep.divakaran@...ricsson.com>,
	Gulshan KARMANI <gulshan.karmani@...ricsson.com>,
	Linus WALLEIJ <linus.walleij@...ricsson.com>
Subject: Re: [PATCH 1/2] Phonet: Implement Pipe Controller to support Nokia
 Slim Modems

Hi Eric,

On Fri, Sep 24, 2010 at 15:52:13 +0200, Eric Dumazet wrote:
> Le vendredi 24 septembre 2010 à 17:53 +0530, Kumar A Sanghvi a écrit :
> 
> > +static int pipe_get_flow_info(struct sock *sk, struct sk_buff *skb,
> > +		u8 *pref_rx_fc, u8 *req_tx_fc)
> > +{
> > +	struct pnpipehdr *hdr = pnp_hdr(skb);
> > +	u8 n_sb;
> > +
> > +	if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
> > +		return -EINVAL;
> 
> This is wrong.
> 
> pskb_may_pull() might change skb->data, so you should do
> 
> {
> 	struct pnpipehdr *hdr;
> 	u8 n_sb;
> 
> 	if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
> 		return -EINVAL;
> 
> 	hdr = pnp_hdr(skb);
> 
Thanks for pointing this out.
I will correct this and post a v2 version of patch.

I will also post a fix for similar problem which now I noticed, based on
your above comment, in pipe_rcv_status function in net/phonet/pep.c

Best regards,
Kumar.
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