linux-kernel - Re: net/llc: BUG in llc_sap_state_process/skb_set_owner

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Message-ID: <CANn89iKww-oSWGWx-PZ_gXYmeFr8NSwJS55vNB=jyaBghTmtvA@mail.gmail.com>
Date:   Sun, 12 Feb 2017 09:10:48 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     acme@...hat.com, "David S. Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: net/llc: BUG in llc_sap_state_process/skb_set_owner_r

On Sun, Feb 12, 2017 at 8:44 AM, Andrey Konovalov <andreyknvl@...gle.com> wrote:
> Hi,
>
> I've got the following error report while fuzzing the kernel with syzkaller.
>
> On commit 926af6273fc683cd98cd0ce7bf0d04a02eed6742.
>
> A reproducer and .config are attached

Thanks for the report.

llc sets skb->sk   without corresponding skb->destructor.

This is considered invalid by our current standards.

As I added the sanity check in skb_destructor() back in linux-3.12
(!!!), I will send the corresponding LLC fix.

( commit 376c7311bdb6efea3322310333576a04d73fbe4c )