netdev - Re: [PATCH net] vrf: fix double free and memory corruption on register

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Message-ID: <5650F668.8020502@cumulusnetworks.com>
Date:	Sat, 21 Nov 2015 15:55:36 -0700
From:	David Ahern <dsa@...ulusnetworks.com>
To:	Nikolay Aleksandrov <razor@...ckwall.org>, netdev@...r.kernel.org
Cc:	shm@...ulusnetworks.com, davem@...emloft.net,
	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Subject: Re: [PATCH net] vrf: fix double free and memory corruption on
 register_netdevice failure

On 11/21/15 11:46 AM, Nikolay Aleksandrov wrote:
> From: Nikolay Aleksandrov<nikolay@...ulusnetworks.com>
>
> When vrf's ->newlink is called, if register_netdevice() fails then it
> does free_netdev(), but that's also done by rtnl_newlink() so a second
> free happens and memory gets corrupted, to reproduce execute the
> following line a couple of times (1 - 5 usually is enough):
> $ for i in `seq 1 5`; do ip link add vrf: type vrf table 1; done;
> This works because we fail in register_netdevice() because of the wrong
> name "vrf:".

Acked-by: David Ahern <dsa@...ulusnetworks.com>

Thanks, Nik.
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