linux-kernel - Re: [PATCH] staging: r8188eu: fix type mismacth

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Date:   Mon, 6 Sep 2021 18:59:57 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Larry.Finger@...inger.net, phil@...lpotter.co.uk,
        gregkh@...uxfoundation.org, straube.linux@...il.com,
        fmdefrancesco@...il.com, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: r8188eu: fix type mismacth

On 9/6/21 09:56, Dan Carpenter wrote:
> On Sun, Sep 05, 2021 at 11:52:16PM +0300, Pavel Skripkin wrote:
>> smatch says:
>> rtw_cmd.c:1165 rtw_setassocsta_cmd() warn: struct type mismatch 'set_stakey_rsp vs set_assocsta_rsp'
>> 
>> Since psetassocsta_rsp has struct set_stakey_rsp * type, it looks like
>> copy-paste failure. This error didn't cause any bugs, because
>> sizeof(struct set_assocsta_parm) > sizeof(struct set_stakey_rsp), but
>> there is no reason for allocation extra unused memory
>> 
>> Fixes: 15865124feed ("staging: r8188eu: introduce new core dir for RTL8188eu driver")
>> Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
>> ---
>>  drivers/staging/r8188eu/core/rtw_cmd.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/drivers/staging/r8188eu/core/rtw_cmd.c b/drivers/staging/r8188eu/core/rtw_cmd.c
>> index fee4208dacba..afe6c7fa594d 100644
>> --- a/drivers/staging/r8188eu/core/rtw_cmd.c
>> +++ b/drivers/staging/r8188eu/core/rtw_cmd.c
>> @@ -1162,7 +1162,7 @@ u8 rtw_setassocsta_cmd(struct adapter  *padapter, u8 *mac_addr)
>>  		goto exit;
>>  	}
>>  
>> -	psetassocsta_rsp = kzalloc(sizeof(struct set_assocsta_rsp), GFP_ATOMIC);
>> +	psetassocsta_rsp = kzalloc(sizeof(struct set_stakey_rsp), GFP_ATOMIC);
>>  	if (!psetassocsta_rsp) {
>>  		kfree(ph2c);
>>  		kfree(psetassocsta_para);
> 
> I'm not sure this is correct.  Might be, might be not.  But we use
> sizeof(struct set_assocsta_rsp) later in the function so it likely leads
> to memory corruption.
> 
>          ph2c->rsp = (u8 *)psetassocsta_rsp;
>          ph2c->rspsz = sizeof(struct set_assocsta_rsp);
> 

Hi, Dan!


Unfortunately, this function is unused, so I will just remove it in v2 :)


With regards,
Pavel Skripkin