oss-security - Re: kernel: l2tp: Fix oops in pppol2tp

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Date: Tue, 6 Jul 2010 15:09:40 -0400 (EDT)
From: Josh Bressers <bressers@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Re: kernel: l2tp: Fix oops in pppol2tp_xmit

Please use CVE-2010-2495

Thanks.

-- 
    JB


----- "Eugene Teo" <eugeneteo@...nel.sg> wrote:

> "When transmitting L2TP frames, we derive the outgoing interface's UDP
> 
> checksum hardware assist capabilities from the tunnel dst dev. This
> can 
> sometimes be NULL, especially when routing protocols are used and 
> routing changes occur. This patch just checks for NULL dst or dev 
> pointers when checking for netdev hardware assist features.
> 
>      BUG: unable to handle kernel NULL pointer dereference at
> 0000000c
>      IP: [<f89d074c>] pppol2tp_xmit+0x341/0x4da [pppol2tp]
>      *pde = 00000000
>      Oops: 0000 [#1] SMP
>      last sysfs file: /sys/class/net/lo/operstate
> [...]"
> 
> Introduced in ffcebb16 (v2.6.29-rc1~581), fixed in 3feec909 (fixed in
> 
> v2.6.34-rc2). (It was later split into different files in commit 
> fd558d18 v2.6.35-rc1).
> 
> I'm not requesting a CVE name for this because it did not affect any
> of 
> our supported kernels. FYI.
> 
> Thanks, Eugene
> -- 
> main(i) { putchar(182623909 >> (i-1) * 5&31|!!(i<7)<<6) && main(++i);
> }

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