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Diffstat (limited to 'net/ipv4/gre.c')
-rw-r--r--net/ipv4/gre.c21
1 files changed, 6 insertions, 15 deletions
diff --git a/net/ipv4/gre.c b/net/ipv4/gre.c
index 9dbe10875fb..dbfc21de347 100644
--- 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/spinlock.h>
#include <net/protocol.h>
@@ -96,27 +97,17 @@ 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 = {