netdev - Re: [patch net-next 2/2] team: avoid using variable-length array

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Message-ID: <20111117151031.GA3209@minipsycho>
Date:	Thu, 17 Nov 2011 16:10:32 +0100
From:	Jiri Pirko <jpirko@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	bhutchings@...arflare.com, shemminger@...tta.com,
	andy@...yhouse.net, fbl@...hat.com, jzupka@...hat.com,
	ivecera@...hat.com, mirqus@...il.com
Subject: Re: [patch net-next 2/2] team: avoid using variable-length array

Thu, Nov 17, 2011 at 03:31:18PM CET, eric.dumazet@...il.com wrote:
>Le jeudi 17 novembre 2011 à 15:16 +0100, Jiri Pirko a écrit :
>> Apparently using variable-length array is not correct
>> (https://lkml.org/lkml/2011/10/23/25). So remove it.
>> 
>> Signed-off-by: Jiri Pirko <jpirko@...hat.com>
>> ---
>>  drivers/net/team/team.c |    9 +++++++--
>>  1 files changed, 7 insertions(+), 2 deletions(-)
>> 
>> diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
>> index 5b169c1..c48ef19 100644
>> --- a/drivers/net/team/team.c
>> +++ b/drivers/net/team/team.c
>> @@ -96,10 +96,13 @@ int team_options_register(struct team *team,
>>  			  size_t option_count)
>>  {
>>  	int i;
>> -	struct team_option *dst_opts[option_count];
>> +	struct team_option **dst_opts;
>>  	int err;
>>  
>> -	memset(dst_opts, 0, sizeof(dst_opts));
>> +	dst_opts = kzalloc(sizeof(struct team_option *) * option_count,
>> +			   GFP_KERNEL);
>> +	if (!dst_opts)
>> +		return -ENOMEM;
>>  	for (i = 0; i < option_count; i++, option++) {
>>  		struct team_option *dst_opt;
>>  
>> @@ -119,12 +122,14 @@ int team_options_register(struct team *team,
>>  	for (i = 0; i < option_count; i++)
>>  		list_add_tail(&dst_opts[i]->list, &team->option_list);
>>  
>> +	kfree(dst_opts);
>>  	return 0;
>>  
>>  rollback:
>>  	for (i = 0; i < option_count; i++)
>>  		kfree(dst_opts[i]);
>>  
>> +	kfree(dst_opts);
>>  	return err;
>>  }
>>  
>
>Please use kmemdup() as well, or someone else will do it ;)
>
>dst_opt = kmalloc(sizeof(*option), GFP_KERNEL);
>...
>memcpy(dst_opt, option, sizeof(*option));
>
>-> dst_opt = kmemdup(...);
>
Sure, I'll do this in separate patch.

Thanks!

Jirka
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