This is a note to let you know that I've just added the patch titled
gre: fix improper error handling
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
gre-fix-improper-error-handling.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From b2be55e21dd28aecd96e8476fc9e9a0e18e33c52 Mon Sep 17 00:00:00 2001
From: "[email protected]" <[email protected]>
Date: Fri, 22 Jul 2011 20:49:40 +0000
Subject: gre: fix improper error handling
From: "[email protected]" <[email protected]>
[ Upstream commit 559fafb94ad9e4cd8774f39241917c57396f9fc5 ]
Fix improper protocol err_handler, current implementation is fully
unapplicable and may cause kernel crash due to double kfree_skb.
Signed-off-by: Dmitry Kozlov <[email protected]>
Acked-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/ipv4/gre.c | 21 ++++++---------------
1 file changed, 6 insertions(+), 15 deletions(-)
--- a/net/ipv4/gre.c
+++ b/net/ipv4/gre.c
@@ -15,6 +15,7 @@
#include <linux/kmod.h>
#include <linux/skbuff.h>
#include <linux/in.h>
+#include <linux/ip.h>
#include <linux/netdevice.h>
#include <linux/version.h>
#include <linux/spinlock.h>
@@ -97,27 +98,17 @@ drop:
static void gre_err(struct sk_buff *skb, u32 info)
{
const struct gre_protocol *proto;
- u8 ver;
-
- if (!pskb_may_pull(skb, 12))
- goto drop;
+ const struct iphdr *iph = (const struct iphdr *)skb->data;
+ u8 ver = skb->data[(iph->ihl<<2) + 1]&0x7f;
- ver = skb->data[1]&0x7f;
if (ver >= GREPROTO_MAX)
- goto drop;
+ return;
rcu_read_lock();
proto = rcu_dereference(gre_proto[ver]);
- if (!proto || !proto->err_handler)
- goto drop_unlock;
- proto->err_handler(skb, info);
- rcu_read_unlock();
- return;
-
-drop_unlock:
+ if (proto && proto->err_handler)
+ proto->err_handler(skb, info);
rcu_read_unlock();
-drop:
- kfree_skb(skb);
}
static const struct net_protocol net_gre_protocol = {
Patches currently in stable-queue which might be from [email protected] are
queue-3.0/gre-fix-improper-error-handling.patch
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