From: Cyrill Gorcunov <gorcunov@gmail.com>
Date: Tue, 1 Nov 2016 20:05:00 +0000 (+0300)
Subject: net: ip, diag -- Adjust raw_abort to use unlocked __udp_disconnect
X-Git-Tag: v4.10-rc1~202^2~346
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=3de864f8c9e488fa57a28f5deb45bb808810ee92;p=karo-tx-linux.git

net: ip, diag -- Adjust raw_abort to use unlocked __udp_disconnect

While being preparing patches for killing raw sockets via
diag netlink interface I noticed that my runs are stuck:

 | [root@pcs7 ~]# cat /proc/`pidof ss`/stack
 | [<ffffffff816d1a76>] __lock_sock+0x80/0xc4
 | [<ffffffff816d206a>] lock_sock_nested+0x47/0x95
 | [<ffffffff8179ded6>] udp_disconnect+0x19/0x33
 | [<ffffffff8179b517>] raw_abort+0x33/0x42
 | [<ffffffff81702322>] sock_diag_destroy+0x4d/0x52

which has not been the case before. I narrowed it down to the commit

 | commit 286c72deabaa240b7eebbd99496ed3324d69f3c0
 | Author: Eric Dumazet <edumazet@google.com>
 | Date:   Thu Oct 20 09:39:40 2016 -0700
 |
 |     udp: must lock the socket in udp_disconnect()

where we start locking the socket for different reason.

So the raw_abort escaped the renaming and we have to
fix this typo using __udp_disconnect instead.

Fixes: 286c72deabaa ("udp: must lock the socket in udp_disconnect()")
CC: David S. Miller <davem@davemloft.net>
CC: Eric Dumazet <eric.dumazet@gmail.com>
CC: David Ahern <dsa@cumulusnetworks.com>
CC: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
CC: James Morris <jmorris@namei.org>
CC: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
CC: Patrick McHardy <kaber@trash.net>
CC: Andrey Vagin <avagin@openvz.org>
CC: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index d78d738fb172..6a0bd68a565b 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -920,7 +920,7 @@ int raw_abort(struct sock *sk, int err)
 
 	sk->sk_err = err;
 	sk->sk_error_report(sk);
-	udp_disconnect(sk, 0);
+	__udp_disconnect(sk, 0);
 
 	release_sock(sk);