netdev - Re: use-after-free in sctp_do

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Message-ID: <CANn89iKEv-q6EFi1eX+Hk_2+jNfZ0ayUqUn_Fh1U7RTs9xjdXg@mail.gmail.com>
Date:	Thu, 3 Dec 2015 06:48:45 -0800
From:	Eric Dumazet <edumazet@...gle.com>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	syzkaller <syzkaller@...glegroups.com>,
	Vladislav Yasevich <vyasevich@...il.com>,
	linux-sctp@...r.kernel.org, netdev <netdev@...r.kernel.org>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: Re: use-after-free in sctp_do_sm

>
> No, I don't. But pr_debug always computes its arguments. See no_printk
> in printk.h. So this use-after-free happens for all users.

Hmm.

pr_debug() should be a nop unless either DEBUG or CONFIG_DYNAMIC_DEBUG are set

On our production kernels, pr_debug() is a nop.

Can you double check ? Thanks !
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