netdev - Re: [PATCH (resubmit)] Fix inet_diag.ko register vs rcv race

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Date:	Mon, 03 Dec 2007 12:01:06 +0300
From:	Pavel Emelyanov <xemul@...nvz.org>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Linux Netdev List <netdev@...r.kernel.org>, devel@...nvz.org
Subject: Re: [PATCH (resubmit)] Fix inet_diag.ko register vs rcv race

Herbert Xu wrote:
> On Thu, Nov 29, 2007 at 04:01:25PM +0300, Pavel Emelyanov wrote:
>> @@ -863,13 +861,13 @@ int inet_diag_register(const struct inet_diag_handler *h)
>>  	if (type >= INET_DIAG_GETSOCK_MAX)
>>  		goto out;
>>  
>> -	spin_lock(&inet_diag_register_lock);
>> +	mutex_lock(&inet_diag_mutex);
>>  	err = -EEXIST;
>>  	if (inet_diag_table[type] == NULL) {
>>  		inet_diag_table[type] = h;
>>  		err = 0;
>>  	}
>> -	spin_unlock(&inet_diag_register_lock);
>> +	mutex_unlock(&inet_diag_mutex);
> 
> Actually this causes a dead-lock when the handlers are built as modules
> because we try to load them with that mutex held.

Ouch! Sorry, I didn't notice this :(

> I've fixed it with this patch on top.

Thanks!

> Cheers,

Pavel

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