netdev - Re: [PATCH 01/11] netlink: add reference of module in netlink_dump

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Date:	Wed, 26 Sep 2012 14:05:58 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	Steffen Klassert <steffen.klassert@...unet.com>
CC:	davem@...emloft.net, netfilter-devel@...r.kernel.org,
	linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
	eric.dumazet@...il.com, pablo@...filter.org,
	linux-crypto@...r.kernel.org, jengelh@...i.de,
	stephen.hemminger@...tta.com
Subject: Re: [PATCH 01/11] netlink: add reference of module in netlink_dump_start

于 2012年09月26日 13:41, Steffen Klassert 写道:
> On Wed, Sep 26, 2012 at 12:52:10PM +0800, Gao feng wrote:
>> +
>>  int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
>>  		       const struct nlmsghdr *nlh,
>>  		       struct netlink_dump_control *control)
>> @@ -1786,6 +1794,7 @@ int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
>>  	cb->done = control->done;
>>  	cb->nlh = nlh;
>>  	cb->data = control->data;
>> +	cb->module = control->module;
>>  	cb->min_dump_alloc = control->min_dump_alloc;
>>  	atomic_inc(&skb->users);
>>  	cb->skb = skb;
>> @@ -1796,19 +1805,27 @@ int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
>>  		return -ECONNREFUSED;
>>  	}
>>  	nlk = nlk_sk(sk);
>> -	/* A dump is in progress... */
>> +
>>  	mutex_lock(nlk->cb_mutex);
>> +	/* A dump is in progress... */
>>  	if (nlk->cb) {
>>  		mutex_unlock(nlk->cb_mutex);
>>  		netlink_destroy_callback(cb);
>> -		sock_put(sk);
>> -		return -EBUSY;
>> +		ret = -EBUSY;
>> +		goto out;
>> +	}
>> +	/* add reference of module witch cb->dump belone to */
>> +	if (cb->module && !try_module_get(cb->module)) {
>> +		mutex_unlock(nlk->cb_mutex);
>> +		ret = -EPROTONOSUPPORT;
>> +		goto out;
> 
> Looks like you leak the allocated netlink_callback here.
> You should call netlink_destroy_callback() before you exit.
> 

oops, I will fix it,thanks very much!
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