linux-kernel - Re: [PATCH AUTOSEL 5.1 011/375] ip6: fix skb leak in ip6frag_expire_frag

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Message-ID: <20190529184837.GF12898@sasha-vm>
Date:   Wed, 29 May 2019 14:48:37 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Stefan Bader <stefan.bader@...onical.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Peter Oskolkov <posk@...gle.com>,
        Florian Westphal <fw@...len.de>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.1 011/375] ip6: fix skb leak in
 ip6frag_expire_frag_queue()

On Thu, May 23, 2019 at 09:47:23AM +0200, Stefan Bader wrote:
>On 22.05.19 21:15, Sasha Levin wrote:
>> From: Eric Dumazet <edumazet@...gle.com>
>>
>> [ Upstream commit 47d3d7fdb10a21c223036b58bd70ffdc24a472c4 ]
>>
>> Since ip6frag_expire_frag_queue() now pulls the head skb
>> from frag queue, we should no longer use skb_get(), since
>> this leads to an skb leak.
>>
>> Stefan Bader initially reported a problem in 4.4.stable [1] caused
>> by the skb_get(), so this patch should also fix this issue.
>
>Just to let everybody know, while changing this has fixed the BUG_ON problem
>while sending (in 4.4) it now crashes when releasing just a little later.
>Still feels like the right direction but not complete, yet.

mhm, this commit is really under David's domain, it squeezed through my
filters as it doesn't actually touch net/. I'll drop it for now.

--
Thanks,
Sasha