linux-kernel - Re: [PATCH] X86: intel_ips, check for kzalloc properly

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Date:	Mon, 21 Jun 2010 17:33:48 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
CC:	Jiri Slaby <jslaby@...e.cz>, mjg@...hat.com,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] X86: intel_ips, check for kzalloc properly

On 06/21/2010 05:25 PM, Jesse Barnes wrote:
> On Mon, 21 Jun 2010 17:02:11 +0200
> Jiri Slaby <jslaby@...e.cz> wrote:
> 
>> Stanse found that there are two NULL checks missing in ips_monitor. So
>> check their value too and bail out appropriately if the allocation
>> failed.
>>
>> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
>> Cc: Jesse Barnes <jbarnes@...tuousgeek.org>
>> Cc: Matthew Garrett <mjg@...hat.com>
>> ---
>>  drivers/platform/x86/intel_ips.c |    3 ++-
>>  1 files changed, 2 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/platform/x86/intel_ips.c b/drivers/platform/x86/intel_ips.c
>> index cdaf40e..3c7ea9a 100644
>> --- a/drivers/platform/x86/intel_ips.c
>> +++ b/drivers/platform/x86/intel_ips.c
>> @@ -931,7 +931,8 @@ static int ips_monitor(void *data)
>>  	mch_samples = kzalloc(sizeof(u16) * IPS_SAMPLE_COUNT, GFP_KERNEL);
>>  	cpu_samples = kzalloc(sizeof(u32) * IPS_SAMPLE_COUNT, GFP_KERNEL);
>>  	mchp_samples = kzalloc(sizeof(u32) * IPS_SAMPLE_COUNT, GFP_KERNEL);
>> -	if (!mcp_samples || !ctv1_samples || !ctv2_samples || !mch_samples) {
>> +	if (!mcp_samples || !ctv1_samples || !ctv2_samples || !mch_samples ||
>> +			!cpu_samples || !mchp_samples) {
>>  		dev_err(&ips->dev->dev,
>>  			"failed to allocate sample array, ips disabled\n");
>>  		kfree(mcp_samples);
> 
> Ah cool, am I also missing the appropriate kfree() calls for the last
> two?  The context doesn't have it.  Otherwise,

I checked when I was patching that and the last is not freed there.
However I didn't add it since at least one must be non-NULL and in this
case it can be only the last. (Until somebody add another allocation
indeed.) So should I add even the last free there?

thanks,
-- 
js
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