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

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Date:	Fri, 24 Sep 2010 15:52:13 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Kumar A Sanghvi <kumar.sanghvi@...ricsson.com>
Cc:	remi.denis-courmont@...ia.com, davem@...emloft.net,
	netdev@...r.kernel.org, STEricsson_nomadik_linux@...t.st.com,
	sudeep.divakaran@...ricsson.com, gulshan.karmani@...ricsson.com,
	Linus Walleij <linus.walleij@...ricsson.com>
Subject: Re: [PATCH 1/2] Phonet: Implement Pipe Controller to support Nokia
 Slim Modems

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);

...





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