diff options
| author | Nicolas Dichtel <nicolas.dichtel@6wind.com> | 2018-01-25 19:03:03 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-09 09:51:48 +0200 |
| commit | 6a3c946b205fd5bc3be583a1f3adbda11128e7ed (patch) | |
| tree | 9ebae9289cee960c327378a4cb2e49c901d639b6 /include | |
| parent | 3a928a262c1c1c63c929ebe40c181376afbcfe41 (diff) | |
net: don't call update_pmtu unconditionally
commit f15ca723c1ebe6c1a06bc95fda6b62cd87b44559 upstream.
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>
Cc: Thomas Deutschmann <whissi@gentoo.org>
Cc: Eddie Chapman <eddie@ehuk.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/dst.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/net/dst.h b/include/net/dst.h index 694c2e6ae618..ebfb4328fdb1 100644 --- a/include/net/dst.h +++ b/include/net/dst.h @@ -520,4 +520,12 @@ static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst) } #endif +static inline void skb_dst_update_pmtu(struct sk_buff *skb, u32 mtu) +{ + struct dst_entry *dst = skb_dst(skb); + + if (dst && dst->ops->update_pmtu) + dst->ops->update_pmtu(dst, NULL, skb, mtu); +} + #endif /* _NET_DST_H */ |