path: root/net/ipv6/ip6_tunnel.c
diff options
authorNicolas Dichtel <nicolas.dichtel@6wind.com>2018-01-25 19:03:03 +0100
committerDavid S. Miller <davem@davemloft.net>2018-01-25 16:27:34 -0500
commitf15ca723c1ebe6c1a06bc95fda6b62cd87b44559 (patch)
treed81f5825fe96dbfc589b19561961814fed78b4fc /net/ipv6/ip6_tunnel.c
parentnet: tcp: close sock if net namespace is exiting (diff)
net: don't call update_pmtu unconditionally
Some dst_ops (e.g. md_dst_ops)) doesn't set this handler. It may result to: "BUG: unable to handle kernel NULL pointer dereference at (null)" Let's add a helper to check if update_pmtu is available before calling it. Fixes: 52a589d51f10 ("geneve: update skb dst pmtu on tx path") Fixes: a93bf0ff4490 ("vxlan: update skb dst pmtu on tx path") CC: Roman Kapl <code@rkapl.cz> CC: Xin Long <lucien.xin@gmail.com> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ip6_tunnel.c')
1 files changed, 2 insertions, 4 deletions
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 9a7cf355bc8c..1ee5584c3555 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -642,8 +642,7 @@ ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
if (rel_info > dst_mtu(skb_dst(skb2)))
goto out;
- skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2,
- rel_info);
+ skb_dst_update_pmtu(skb2, rel_info);
icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
@@ -1131,8 +1130,7 @@ route_lookup:
mtu = 576;
- if (skb_dst(skb) && !t->parms.collect_md)
- skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
+ skb_dst_update_pmtu(skb, mtu);
if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
*pmtu = mtu;
err = -EMSGSIZE;