netdev - Re: bonding: fix device leak on error in bond

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Date:	Fri, 26 Feb 2010 17:17:40 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Andy Gospodarek <andy@...yhouse.net>
CC:	Linux Netdev List <netdev@...r.kernel.org>,
	Jay Vosburgh <fubar@...ibm.com>
Subject: Re: bonding: fix device leak on error in bond_create()

Andy Gospodarek wrote:
> On Fri, Feb 26, 2010 at 04:35:52PM +0100, Patrick McHardy wrote:
> 
>> commit f357a5caa0ca29b74811a0fc08efb5ae4aade959
>> Author: Patrick McHardy <kaber@...sh.net>
>> Date:   Thu Feb 25 20:21:10 2010 +0100
>>
>>     bonding: fix device leak on error in bond_create()
>>     
>>     When the register_netdevice() call fails, the newly allocated device is
>>     not freed.
>>     
>>     Signed-off-by: Patrick McHardy <kaber@...sh.net>
>>
>> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>> index 1787e3c..430c022 100644
>> --- a/drivers/net/bonding/bond_main.c
>> +++ b/drivers/net/bonding/bond_main.c
>> @@ -4946,6 +4946,8 @@ int bond_create(struct net *net, const char *name)
>>  	}
>>  
>>  	res = register_netdevice(bond_dev);
>> +	if (res < 0)
>> +		goto out_netdev;
>>  
>>  out:
>>  	rtnl_unlock();
> 
> Acked-by: Andy Gospodarek <andy@...yhouse.net>
> 
> Seems like a good idea.  I know register_netdevice is always supposed to
> return a value < 0 on error, but this would work if it didn't for some
> reason.

I don't care much, but that would be a bug since we'd return
invalid errno codes to userspace.
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