linux-kernel - [10/73] tcp: fix inet_twsk

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Date:	Fri, 04 Mar 2011 16:55:15 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Eric Dumazet <eric.dumazet@...il.com>,
	Daniel Lezcano <daniel.lezcano@...e.fr>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [10/73] tcp: fix inet_twsk_deschedule()

2.6.37-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Eric Dumazet <eric.dumazet@...il.com>

commit 91035f0b7d89291af728b6f3e370c3be58fcbe1b upstream.

Eric W. Biederman reported a lockdep splat in inet_twsk_deschedule()

This is caused by inet_twsk_purge(), run from process context,
and commit 575f4cd5a5b6394577 (net: Use rcu lookups in inet_twsk_purge.)
removed the BH disabling that was necessary.

Add the BH disabling but fine grained, right before calling
inet_twsk_deschedule(), instead of whole function.

With help from Linus Torvalds and Eric W. Biederman

Reported-by: Eric W. Biederman <ebiederm@...ssion.com>
Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
CC: Daniel Lezcano <daniel.lezcano@...e.fr>
CC: Pavel Emelyanov <xemul@...nvz.org>
CC: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/ipv4/inet_timewait_sock.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/ipv4/inet_timewait_sock.c
+++ b/net/ipv4/inet_timewait_sock.c
@@ -505,7 +505,9 @@ restart:
 			}

 			rcu_read_unlock();
+			local_bh_disable();
 			inet_twsk_deschedule(tw, twdr);
+			local_bh_enable();
 			inet_twsk_put(tw);
 			goto restart_rcu;
 		}

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