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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/ipv4/ip_tunnel.c | |
| parent | 4ee806d51176ba7b8ff1efd81f271d7252e03a1d (diff) | |
| download | linux-f15ca723c1ebe6c1a06bc95fda6b62cd87b44559.tar.gz linux-f15ca723c1ebe6c1a06bc95fda6b62cd87b44559.tar.bz2 linux-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.c | 3 |
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) && |