linux-kernel - [34-longterm 195/260] Phonet: Correct header retrieval after pskb_may

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Message-Id: <1293952756-15010-196-git-send-email-paul.gortmaker@windriver.com>
Date:	Sun,  2 Jan 2011 02:18:11 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org,
	Kumar Sanghvi <kumar.sanghvi@...ricsson.com>,
	"David S. Miller" <davem@...emloft.net>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 195/260] Phonet: Correct header retrieval after pskb_may_pull

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

commit a91e7d471e2e384035b9746ea707ccdcd353f5dd upstream.

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: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 net/phonet/pep.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index e2a9576..dc1e8ae 100644
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -225,12 +225,13 @@ static void pipe_grant_credits(struct sock *sk)
 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]);
-- 
1.7.3.3

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