[PATCH] kernel 2.6.35: ixgbe: skip non IPv4 packets in ATR filter

[Guillaume Gaudonville <guillaume.gaudonville@6wind.com>]

Hello,

In driver ixgbe, ixgbe_atr may cause crashes for non-ipv4 packets. Just 
add a test to check skb->protocol:

 From fcb81aa89b6819f95349a4ed8c30f0629430aa1d Mon Sep 17 00:00:00 2001
From: Guillaume Gaudonville <guillaume.gaudonville@6wind.com>
Date: Thu, 17 Jun 2010 16:02:14 +0200
Subject: [PATCH] ixgbe: skip non IPv4 packets in ATR filter

It may crash on short packets due to ip_hdr() access.

Signed-off-by: Guillaume Gaudonville <guillaume.gaudonville@6wind.com>
---
 drivers/net/ixgbe/ixgbe_main.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index b2af2f6..3581dbe 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -6019,7 +6019,6 @@ static void ixgbe_tx_queue(struct ixgbe_adapter 
*adapter,
 static void ixgbe_atr(struct ixgbe_adapter *adapter, struct sk_buff *skb,
                      int queue, u32 tx_flags)
 {
-       /* Right now, we support IPv4 only */
        struct ixgbe_atr_input atr_input;
        struct tcphdr *th;
        struct iphdr *iph = ip_hdr(skb);
@@ -6028,6 +6027,10 @@ static void ixgbe_atr(struct ixgbe_adapter 
*adapter, struct sk_buff *skb,
        u32 src_ipv4_addr, dst_ipv4_addr;
        u8 l4type = 0;
 
+       /* Right now, we support IPv4 only */
+       if (skb->protocol != htons(ETH_P_IP))
+               return;
+
        /* check if we're UDP or TCP */
        if (iph->protocol == IPPROTO_TCP) {
                th = tcp_hdr(skb);
-- 
1.5.6.5

-- 
Guillaume Gaudonville
guillaume.gaudonville@6wind.com