ip_tunnel_core: iptunnel_handle_offloads returns int and doesn't free skb
This patch updates the IP tunnel core function iptunnel_handle_offloads so
that we return an int and do not free the skb inside the function. This
actually allows us to clean up several paths in several tunnels so that we
can free the skb at one point in the path without having to have a
secondary path if we are supporting tunnel offloads.
In addition it should resolve some double-free issues I have found in the
tunnels paths as I believe it is possible for us to end up triggering such
an event in the case of fou or gue.
Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c
index d039f8f..7ac5ec8 100644
--- a/net/ipv4/fou.c
+++ b/net/ipv4/fou.c
@@ -802,11 +802,11 @@
int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM ? SKB_GSO_UDP_TUNNEL_CSUM :
SKB_GSO_UDP_TUNNEL;
__be16 sport;
+ int err;
- skb = iptunnel_handle_offloads(skb, type);
-
- if (IS_ERR(skb))
- return PTR_ERR(skb);
+ err = iptunnel_handle_offloads(skb, type);
+ if (err)
+ return err;
sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev),
skb, 0, 0, false);
@@ -826,6 +826,7 @@
__be16 sport;
void *data;
bool need_priv = false;
+ int err;
if ((e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) &&
skb->ip_summed == CHECKSUM_PARTIAL) {
@@ -836,10 +837,9 @@
optlen += need_priv ? GUE_LEN_PRIV : 0;
- skb = iptunnel_handle_offloads(skb, type);
-
- if (IS_ERR(skb))
- return PTR_ERR(skb);
+ err = iptunnel_handle_offloads(skb, type);
+ if (err)
+ return err;
/* Get source port (based on flow hash) before skb_push */
sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev),