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Re: net/llc: BUG in llc_sap_state_process/skb_set_owner_r

Started byEric Dumazet <edumazet@google.com>
First post2017-02-12 18:20 +0100
Last post2017-02-12 18:20 +0100
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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

#1579253 — Re: net/llc: BUG in llc_sap_state_process/skb_set_owner_r

FromEric Dumazet <edumazet@google.com>
Date2017-02-12 18:20 +0100
SubjectRe: net/llc: BUG in llc_sap_state_process/skb_set_owner_r
Message-ID<ta5YC-Bx-21@gated-at.bofh.it>
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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