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rtnetlink: fallback to UNSPEC if current family has no doit callback

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We need to use PF_UNSPEC in case the requested family has no doit
callback, otherwise this now fails with EOPNOTSUPP instead of running the
unspec doit callback, as before.

Fixes: 6853dd4881 ("rtnetlink: protect handler table with rcu")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2017-08-10 16:53:01 +02:00 committed by David S. Miller
parent d38a65125f
commit 8caa38b56c
1 changed files with 6 additions and 0 deletions
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6
net/core/rtnetlink.c
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@ -4221,6 +4221,12 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
return err;
}
doit = READ_ONCE(handlers[type].doit);
if (!doit) {
family = PF_UNSPEC;
handlers = rcu_dereference(rtnl_msg_handlers[family]);
}
flags = READ_ONCE(handlers[type].flags);
if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
refcount_inc(&rtnl_msg_handlers_ref[family]);