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-rw-r--r--net/ipv4/ip_gre.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 177d26d8fb9c..0fe6c936dc54 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -473,8 +473,6 @@ static void __gre_xmit(struct sk_buff *skb, struct net_device *dev,
static int gre_handle_offloads(struct sk_buff *skb, bool csum)
{
- if (csum && skb_checksum_start(skb) < skb->data)
- return -EINVAL;
return iptunnel_handle_offloads(skb, csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
}
@@ -632,15 +630,20 @@ static netdev_tx_t ipgre_xmit(struct sk_buff *skb,
}
if (dev->header_ops) {
+ const int pull_len = tunnel->hlen + sizeof(struct iphdr);
+
if (skb_cow_head(skb, 0))
goto free_skb;
tnl_params = (const struct iphdr *)skb->data;
+ if (pull_len > skb_transport_offset(skb))
+ goto free_skb;
+
/* Pull skb since ip_tunnel_xmit() needs skb->data pointing
* to gre header.
*/
- skb_pull(skb, tunnel->hlen + sizeof(struct iphdr));
+ skb_pull(skb, pull_len);
skb_reset_mac_header(skb);
} else {
if (skb_cow_head(skb, dev->needed_headroom))