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Re: net/llc: BUG in llc_sap_state_process/skb_set_owner_r

From Eric Dumazet <edumazet@google.com>
Newsgroups linux.kernel
Subject Re: net/llc: BUG in llc_sap_state_process/skb_set_owner_r
Date 2017-02-12 18:20 +0100
Message-ID <ta5YC-Bx-21@gated-at.bofh.it> (permalink)
References <ta5vA-cb-41@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Sun, Feb 12, 2017 at 8:44 AM, Andrey Konovalov <andreyknvl@google.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 )

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Re: net/llc: BUG in llc_sap_state_process/skb_set_owner_r Eric Dumazet <edumazet@google.com> - 2017-02-12 18:20 +0100

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