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Diffstat (limited to 'net/ipv4/ip_gre.c')
-rw-r--r--net/ipv4/ip_gre.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 8260a707b9b8..8f377dad5489 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -260,7 +260,8 @@ static __be32 tunnel_id_to_key(__be64 x)
#endif
}
-static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
+static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
+ int hdr_len)
{
struct net *net = dev_net(skb->dev);
struct metadata_dst *tun_dst = NULL;
@@ -278,6 +279,9 @@ static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
iph->saddr, iph->daddr, tpi->key);
if (tunnel) {
+ if (iptunnel_pull_header(skb, hdr_len, tpi->proto, false) < 0)
+ goto drop;
+
skb_pop_mac_header(skb);
if (tunnel->collect_md) {
__be16 flags;
@@ -294,6 +298,10 @@ static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
return PACKET_RCVD;
}
return PACKET_REJECT;
+
+drop:
+ kfree_skb(skb);
+ return PACKET_RCVD;
}
static int gre_rcv(struct sk_buff *skb)
@@ -314,10 +322,7 @@ static int gre_rcv(struct sk_buff *skb)
if (hdr_len < 0)
goto drop;
- if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
- goto drop;
-
- if (ipgre_rcv(skb, &tpi) == PACKET_RCVD)
+ if (ipgre_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
return 0;
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);