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Date:   Sun, 12 Feb 2017 09:10:48 -0800
From:   Eric Dumazet <>
To:     Andrey Konovalov <>
Cc:, "David S. Miller" <>,
        netdev <>,
        LKML <>,
        Dmitry Vyukov <>,
        Kostya Serebryany <>,
        syzkaller <>
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 <> 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 )

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