linux-kernel - Re: [PATCH v1] devres: Initialize a uninitialized struct member

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Date: Tue, 18 Jun 2024 19:29:59 +0800
From: quic_zijuhu <quic_zijuhu@...cinc.com>
To: Greg KH <gregkh@...uxfoundation.org>
CC: <rafael@...nel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] devres: Initialize a uninitialized struct member

On 6/18/2024 2:14 AM, Greg KH wrote:
> On Mon, Jun 17, 2024 at 09:09:25PM +0800, Zijun Hu wrote:
>> Use memset() after kmalloc() a struct devres_group to initialize
>> potential uninitialized members such as @color within kernel API
>> devres_open_group() as alloc_dr() does.
>>
>> Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>
>> ---
>>  drivers/base/devres.c | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/base/devres.c b/drivers/base/devres.c
>> index 3df0025d12aa..ba3e4603cd77 100644
>> --- a/drivers/base/devres.c
>> +++ b/drivers/base/devres.c
>> @@ -558,6 +558,10 @@ void * devres_open_group(struct device *dev, void *id, gfp_t gfp)
>>  	if (unlikely(!grp))
>>  		return NULL;
>>  
>> +	/* No need to clear memory twice */
>> +	if (!(gfp & __GFP_ZERO))
>> +		memset(grp, 0, sizeof(*grp));
> 
> Is this an actual bugfix (i.e. do we have uninitialized fields today?)
> 
no, maybe take it as code optimization instead of bugfix.
yes, field grp->color is NOT initialized.
> If so, what commit does this fix?
> 
> thanks,
> 
> greg k-h