netdev - Re: [Patch net] garp: fix a NULL pointer dereference bug

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Message-ID: <1362408975.15793.92.camel@edumazet-glaptop>
Date:	Mon, 04 Mar 2013 06:56:15 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Cong Wang <amwang@...hat.com>
Cc:	netdev@...r.kernel.org, bugs@...m.in,
	David Ward <david.ward@...mit.edu>,
	Stephen Hemminger <stephen@...workplumber.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [Patch net] garp: fix a NULL pointer dereference bug

On Mon, 2013-03-04 at 17:55 +0800, Cong Wang wrote:
> On Sun, 2013-03-03 at 21:26 -0800, Eric Dumazet wrote:
> > 
> > Nope this patch doesnt solve the problem
> > 
> > Crash is in :
> > 
> > 49 8b 1c c6             mov    (%r14,%rax,8),%rbx 
> > 
> > Thats because r14 (port) is NULL
> > 
> > 
> > 
> 
> Hmm, but I can't see how it can be NULL, the only place of NULL'ing it
> is inside garp_release_port(), right after the piece of code that I
> patched.
> 
> Thanks!
> 

Maybe port is NULL from the beginning.

Try to inject memory allocations error in garp_init_port()



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