netdev - Re: [Bugme-new] [Bug 14330] New: Kernel

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Date:	Tue, 13 Oct 2009 19:48:06 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	netdev@...r.kernel.org
Cc:	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org, hannes@...essinduktion.org
Subject: Re: [Bugme-new] [Bug 14330] New: Kernel


(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Tue, 6 Oct 2009 00:16:31 GMT bugzilla-daemon@...zilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=14330
> 
>                URL: NULL pointer dereference with arp_notify and no ip
>                     address
>            Summary: Kernel
>            Product: Networking
>            Version: 2.5
>     Kernel Version: 2.6.30.8-64.fc11.x86_64
>           Platform: All
>         OS/Version: Linux
>               Tree: Fedora
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: IPV4
>         AssignedTo: shemminger@...ux-foundation.org
>         ReportedBy: hannes@...essinduktion.org
>         Regression: No
> 
> 
> A NULL pointer dereference happens if arp_notify is enabled, no ip address is
> set
> and the mac address changes on an interface.
> 
> Steps to reproduce:
> sysctl -w net.ipv4.conf.all.arp_notify=1
> ip a f dev eth0
> ip l s eth0 a 02:00:00:00:00:00
> 
> It seems that in function inetdev_event (net/ipv4/devinet.c:1081) the
> dereference of in_dev->ifa_list->ifa_address blows up because in_dev->ifa_list
> is NULL.
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