netdev - Re: Double free of dst_entry in ipv4_dst

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Message-ID: <1449848913.9768.19.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 11 Dec 2015 07:48:33 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	dwilder@...ibm.com
Cc:	netdev@...r.kernel.org, predeep@...ibm.com, mjtarsel@...ibm.com
Subject: Re: Double free of dst_entry in ipv4_dst_destroy()

On Fri, 2015-12-11 at 06:23 -0800, Eric Dumazet wrote:
> On Sun, 2015-12-06 at 17:58 -0800, Eric Dumazet wrote:
> > On Sun, 2015-12-06 at 13:03 -0800, Eric Dumazet wrote:
> > 
> > > But then when later we promote a skb->dst to a refctounted one
> > > (skb_dst_force(), we might make sure we abort the operation if __refcnt
> > > == 0 ( and DST_NOCACHE is in dst->flags)
> > > 
> > 
> > Minimum patch would be :
> > 
> 
> Here is a more complete patch, it should fix the issue I think :

Hmm, I'll send a v3, I forgot to test DST_NOCACHE properly.


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