netdev - Re: oops / null deref in __inet6_check_established(), kernel 2.6.29-rc6

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Date:	Fri, 27 Feb 2009 22:16:18 -0500
From:	Kyle McMartin <kyle@...radead.org>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: oops / null deref in __inet6_check_established(), kernel
	2.6.29-rc6

From: Kyle McMartin <kyle@...hat.com>

This only seems to show up when CONFIG_NET_NS is enabled. (Reproduced on
git HEAD with that option on, doesn't occur with the option off.)

I will confess complete ignorance to the network stack, but this patch
fixes things... ipv4 seems to have the same namespace support, but
increments the sock_net, not the twsk_net.

I'll probably put this patch into Fedora, if only to prevent this from
being used as a local DoS by an unprivileged user.

Signed-off-by: Kyle McMartin <kyle@...hat.com>

diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index 8fe267f..1bcc343 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -258,11 +258,11 @@ unique:
 
 	if (twp != NULL) {
 		*twp = tw;
-		NET_INC_STATS_BH(twsk_net(tw), LINUX_MIB_TIMEWAITRECYCLED);
+		NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED);
 	} else if (tw != NULL) {
 		/* Silly. Should hash-dance instead... */
 		inet_twsk_deschedule(tw, death_row);
-		NET_INC_STATS_BH(twsk_net(tw), LINUX_MIB_TIMEWAITRECYCLED);
+		NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED);
 
 		inet_twsk_put(tw);
 	}
--
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