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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/ipv4/ip_tunnel.c
parentnet: tcp: close sock if net namespace is exiting (diff)
downloadlinux-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/ipv4/ip_tunnel.c')
-rw-r--r--net/ipv4/ip_tunnel.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 5ddb1cb52bd4..6d21068f9b55 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -520,8 +520,7 @@ static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb,
else
mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
- if (skb_dst(skb))
- skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
+ skb_dst_update_pmtu(skb, mtu);
if (skb->protocol == htons(ETH_P_IP)) {
if (!skb_is_gso(skb) &&