netdev - Re: [PATCH] vlan: Fix register_vlan

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Message-Id: <20091117.064521.97621798.davem@davemloft.net>
Date:	Tue, 17 Nov 2009 06:45:21 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, kaber@...sh.net
Subject: Re: [PATCH] vlan: Fix register_vlan_dev() error path

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 17 Nov 2009 15:41:26 +0100

> David Miller a écrit :
> 
>> Eric, please make allocation failure cause the vlan_setup()
>> to fail and propagate -EFAULT back to the caller.
> 
> Sure ! (You meant -ENOMEM probably...)

Indeed.

> [PATCH] vlan: Fix register_vlan_dev() error path
> 
> In case register_netdevice() returns an error, and a new vlan_group was
> allocated and inserted in vlan_group_hash[] we call vlan_group_free() without
> deleting group from hash table. Future lookups can give infinite loops or crashes.
> 
> We must delete the vlan_group using RCU safe procedure.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Good catch, applied to net-2.6 and queued up for -stable.
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