netdev - [net] netlink: Reset portid after netlink

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Message-ID: <20150516135028.GA1271@gondor.apana.org.au>
Date:	Sat, 16 May 2015 21:50:28 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...hat.com>
Cc:	eric.dumazet@...il.com, tgraf@...g.ch, netdev@...r.kernel.org,
	ying.xue@...driver.com
Subject: [net] netlink: Reset portid after netlink_insert failure

The commit c5adde9468b0714a051eac7f9666f23eb10b61f7 ("netlink:
eliminate nl_sk_hash_lock") breaks the autobind retry mechanism
because it doesn't reset portid after a failed netlink_insert.

This means that should autobind fail the first time around, then
the socket will be stuck in limbo as it can never be bound again
since it already has a non-zero portid.

Fixes: c5adde9468b0 ("netlink: eliminate nl_sk_hash_lock") 
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 6ffce5b..d2a4438 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1081,6 +1081,7 @@ static int netlink_insert(struct sock *sk, u32 portid)
 	if (err) {
 		if (err == -EEXIST)
 			err = -EADDRINUSE;
+		nlk_sk(sk)->portid = 0;
 		sock_put(sk);
 	}
 
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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