linux-kernel - [66/82] Phonet: Correct header retrieval after pskb_may

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Date:	Fri, 19 Nov 2010 13:56:27 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Kumar Sanghvi <kumar.sanghvi@...ricsson.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	RÃ©mi Denis-Courmont 
	<remi.denis-courmont@...ia.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [66/82] Phonet: Correct header retrieval after pskb_may_pull

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------


From: Kumar Sanghvi <kumar.sanghvi@...ricsson.com>

[ Upstream commit a91e7d471e2e384035b9746ea707ccdcd353f5dd ]

Retrieve the header after doing pskb_may_pull since, pskb_may_pull
could change the buffer structure.

This is based on the comment given by Eric Dumazet on Phonet
Pipe controller patch for a similar problem.

Signed-off-by: Kumar Sanghvi <kumar.sanghvi@...ricsson.com>
Acked-by: Linus Walleij <linus.walleij@...ricsson.com>
Acked-by: Eric Dumazet <eric.dumazet@...il.com>
Acked-by: Rémi Denis-Courmont <remi.denis-courmont@...ia.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 net/phonet/pep.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -225,12 +225,13 @@ static void pipe_grant_credits(struct so
 static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb)
 {
 	struct pep_sock *pn = pep_sk(sk);
-	struct pnpipehdr *hdr = pnp_hdr(skb);
+	struct pnpipehdr *hdr;
 	int wake = 0;
 
 	if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
 		return -EINVAL;
 
+	hdr = pnp_hdr(skb);
 	if (hdr->data[0] != PN_PEP_TYPE_COMMON) {
 		LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n",
 				(unsigned)hdr->data[0]);


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