linux-kernel - Re: [PATCH] platform/x86: ideapad-laptop: fix a NULL pointer dereference

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Date:   Tue, 11 May 2021 13:39:54 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Ike Panhc <ike.pan@...onical.com>,
        Qiu Wenbo <qiuwenbo@...inos.com.cn>, mgross@...ux.intel.com
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86: ideapad-laptop: fix a NULL pointer
 dereference

Hi,

On 4/30/21 10:45 AM, Ike Panhc wrote:
> On 4/28/21 1:06 PM, Qiu Wenbo wrote:
>> The third parameter of dytc_cql_command should not be NULL since it will
>> be dereferenced immediately.
>>
>> Signed-off-by: Qiu Wenbo <qiuwenbo@...inos.com.cn>
> 
> Fixes: ff36b0d953dc4 ("platform/x86: ideapad-laptop: rework and create new ACPI helpers")
> Acked-by: Ike Panhc <ike.pan@...onical.com>

Thank you I've added this to my review-hans branch with the 2 above
tags added. I'll also add this to my fixes branch and include it in
a future pdx86 fixes pull-req for Linus for 5.13.

Thank you for your patch, I've applied this patch to my review-hans 
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans



> 
>> ---
>>  drivers/platform/x86/ideapad-laptop.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
>> index 6cb5ad4be231..8f871151f0cc 100644
>> --- a/drivers/platform/x86/ideapad-laptop.c
>> +++ b/drivers/platform/x86/ideapad-laptop.c
>> @@ -809,6 +809,7 @@ static int dytc_profile_set(struct platform_profile_handler *pprof,
>>  {
>>  	struct ideapad_dytc_priv *dytc = container_of(pprof, struct ideapad_dytc_priv, pprof);
>>  	struct ideapad_private *priv = dytc->priv;
>> +	unsigned long output;
>>  	int err;
>>  
>>  	err = mutex_lock_interruptible(&dytc->mutex);
>> @@ -829,7 +830,7 @@ static int dytc_profile_set(struct platform_profile_handler *pprof,
>>  
>>  		/* Determine if we are in CQL mode. This alters the commands we do */
>>  		err = dytc_cql_command(priv, DYTC_SET_COMMAND(DYTC_FUNCTION_MMC, perfmode, 1),
>> -				       NULL);
>> +				       &output);
>>  		if (err)
>>  			goto unlock;
>>  	}
>>
>