netdev - Re: [BUG] 3.2-rc2: BUG kmalloc-8: Redzone overwritten

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Date:	Sat, 26 Nov 2011 12:54:38 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, Matt Mackall <mpm@...enic.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [BUG] 3.2-rc2: BUG kmalloc-8: Redzone overwritten

On Mon, 2011-11-21 at 12:22 +0200, Sasha Levin wrote:
> On Mon, 2011-11-21 at 11:21 +0100, Eric Dumazet wrote:
> > Le lundi 21 novembre 2011 à 11:15 +0100, Eric Dumazet a écrit :
> > 
> > > 
> > > Hmm, trinity tries to crash decnet ;)
> > > 
> > > Maybe we should remove this decnet stuff for good instead of tracking
> > > all bugs just for the record. Is there anybody still using decnet ?
> > > 
> > > For example dn_start_slow_timer() starts a timer without holding a
> > > reference on struct sock, this is highly suspect.
> > > 
> > > [PATCH] decnet: proper socket refcounting
> > > 
> > > Better use sk_reset_timer() / sk_stop_timer() helpers to make sure we
> > > dont access already freed/reused memory later.
> > > 
> > > Reported-by: Sasha Levin <levinsasha928@...il.com>
> > > Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> > 
> > Hmm, I forgot to remove the sock_hold(sk) call from dn_slow_timer(),
> > here is V2 :
> > 
> > [PATCH] decnet: proper socket refcounting
> > 
> > Better use sk_reset_timer() / sk_stop_timer() helpers to make sure we
> > dont access already freed/reused memory later.
> > 
> > Reported-by: Sasha Levin <levinsasha928@...il.com>
> > Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> > ---
> 
> [snip]
> 
> Applied locally and running same tests as before, will update with
> results.
> 

Looks ok after a couple days of testing.

	Tested-by: Sasha Levin <levinsasha928@...il.com>

-- 

Sasha.

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