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| author |   Nicolas Dichtel <nicolas.dichtel@6wind.com> | 2018-01-25 19:03:03 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-01-25 16:27:34 -0500 |
| commit | f15ca723c1ebe6c1a06bc95fda6b62cd87b44559 (patch) | |
| tree | d81f5825fe96dbfc589b19561961814fed78b4fc /net/ipv6/ip6_tunnel.c | |
| parent | net: tcp: close sock if net namespace is exiting (diff) | |
| download | linux-dev-f15ca723c1ebe6c1a06bc95fda6b62cd87b44559.tar.xz linux-dev-f15ca723c1ebe6c1a06bc95fda6b62cd87b44559.zip | |
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')
| -rw-r--r-- | net/ipv6/ip6_tunnel.c | 6 |
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; |