netdev - Re: use-after-free in sixpack

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Date:	Thu, 17 Dec 2015 11:41:04 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Andreas Koensgen <ajk@...nets.uni-bremen.de>,
	linux-hams@...r.kernel.org, netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: use-after-free in sixpack_close

> This report is then followed by a dozen of other use-after-free reports.
> 
> On commit edb42dc7bc0da0125ceacab810a553ce1f0cac8d (Dec 15).
> 
> Thank you

sixpack_close does unregister_netdev(sp->dev), which frees sp as sp is
actually allocated via alloc_netdev()

Then deletes two timers within sp

Then frees two buffers indexed off sp

The mkiss driver also appears to share the same bug and references
ax->rbuff/xbuff after they have been freed, and then writes to ax->tty.


Alan



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