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Date: Tue, 03 Mar 2009 14:21:02 -0800 (PST)
From: David Miller <davem@...emloft.net>
To: cebbert@...hat.com
Cc: netdev@...r.kernel.org
Subject: Re: oops / null deref in __inet6_check_established(), kernel
2.6.29-rc6
From: Chuck Ebbert <cebbert@...hat.com>
Date: Tue, 24 Feb 2009 18:35:54 -0500
> On Tue, 24 Feb 2009 15:27:04 -0800 (PST)
> David Miller <davem@...emloft.net> wrote:
>
> > From: Chuck Ebbert <cebbert@...hat.com>
> > Date: Tue, 24 Feb 2009 18:21:47 -0500
> >
> > > (This doesn't happen on 2.6.27/28)
> > >
> > > tw is NULL at net/ipv6/inet6_hashtables.c:261:
> > >
> > > if (twp != NULL) {
> > > *twp = tw;
> > > ===> NET_INC_STATS_BH(twsk_net(tw), LINUX_MIB_TIMEWAITRECYCLED);
> > > } else if (tw != NULL) {
> > >
> > > I can reproduce this on real hardware on x86_64 too...
> >
> > How? :-)
>
> Oops, forgot to add the bug URL:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=486889
>
> Steps to Reproduce:
> 1. Get minirpc 0.3.2 [http://minirpc.cs.cmu.edu/download/minirpc-0.3.2.tar.gz]
> 2. Run ./configure ; make ; make check
Should be fixed by:
commit 3f53a38131a4e7a053c0aa060aba0411242fb6b9
Author: Pavel Emelyanov <xemul@...nvz.org>
Date: Thu Feb 26 03:35:13 2009 -0800
ipv6: don't use tw net when accounting for recycled tw
We already have a valid net in that place, but this is not just a
cleanup - the tw pointer can be NULL there sometimes, thus causing
an oops in NET_NS=y case.
The same place in ipv4 code already works correctly using existing
net, rather than tw's one.
The bug exists since 2.6.27.
Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
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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