From 0b7f22aab4e960c75e82ad696ef852f9b0015e7d Mon Sep 17 00:00:00 2001
From: Olaf Kirch <okir@suse.de>
Date: Mon, 11 Jul 2005 21:01:42 -0700
Subject: [PATCH] [IPV4]: Prevent oops when printing martian source
In some cases, we may be generating packets with a source address that
qualifies as martian. This can happen when we're in the middle of setting
up the network, and netfilter decides to reject a packet with an RST.
The IPv4 routing code would try to print a warning and oops, because
locally generated packets do not have a valid skb->mac.raw pointer
at this point.
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/ipv4/route.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 726ea5e8180a..d675ff80b04d 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1685,7 +1685,7 @@ static void ip_handle_martian_source(struct net_device *dev,
printk(KERN_WARNING "martian source %u.%u.%u.%u from "
"%u.%u.%u.%u, on dev %s\n",
NIPQUAD(daddr), NIPQUAD(saddr), dev->name);
- if (dev->hard_header_len) {
+ if (dev->hard_header_len && skb->mac.raw) {
int i;
unsigned char *p = skb->mac.raw;
printk(KERN_WARNING "ll header: ");
--
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