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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
[IPV4]: ip_route_input panic fix
This fixes http://bugzilla.kernel.org/show_bug.cgi?id=6388
The bug is caused by ip_route_input dereferencing skb->nh.protocol of
the dummy skb passed dow from inet_rtm_getroute (Thanks Thomas for seeing
it). It only happens if the route requested is for a multicast IP
address.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
authored by Stephen Hemminger and committed by David S. Miller d2c962b8 c19f7a9e
+4
-1
net/ipv4/route.c
+4
-1
net/ipv4/route.c
···
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/* Reserve room for dummy headers, this skb can pass
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through good chunk of routing engine.
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*/
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-
skb->mac.raw = skb->data;
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+
skb->mac.raw = skb->nh.raw = skb->data;
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+
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+
/* Bugfix: need to give ip_route_input enough of an IP header to not gag. */
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+
skb->nh.iph->protocol = IPPROTO_ICMP;
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skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr));
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if (rta[RTA_SRC - 1])