linux-kernel - Re: [PATCH v3 2/3] staging: rtl8712: fix uninit-value in r871xu_drv

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Date:   Fri, 6 May 2022 15:35:05 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     Wang Cheng <wanngchenng@...il.com>, dan.carpenter@...cle.com
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] staging: rtl8712: fix uninit-value in
 r871xu_drv_init()

Hi Pavel,

On 5/6/22 15:27, Pavel Skripkin wrote:
> Hi Wang,
> 
> On 5/6/22 14:59, Wang Cheng wrote:
>> Reported-and-tested-by: syzbot+6f5ecd144854c0d8580b@...kaller.appspotmail.com
>> Signed-off-by: Wang Cheng <wanngchenng@...il.com>
>> ---
>>   drivers/staging/rtl8712/usb_intf.c | 6 +++---
>>   1 file changed, 3 insertions(+), 3 deletions(-)
>> 
>> diff --git a/drivers/staging/rtl8712/usb_intf.c b/drivers/staging/rtl8712/usb_intf.c
>> index ee4c61f85a07..50dcd3ecb685 100644
>> --- a/drivers/staging/rtl8712/usb_intf.c
>> +++ b/drivers/staging/rtl8712/usb_intf.c
>> @@ -538,13 +538,13 @@ static int r871xu_drv_init(struct usb_interface *pusb_intf,
>>   		} else {
>>   			AutoloadFail = false;
>>   		}
>> -		if (((mac[0] == 0xff) && (mac[1] == 0xff) &&
>> +		if ((!AutoloadFail) ||
>> +		    ((mac[0] == 0xff) && (mac[1] == 0xff) &&
>>   		     (mac[2] == 0xff) && (mac[3] == 0xff) &&
>>   		     (mac[4] == 0xff) && (mac[5] == 0xff)) ||
>>   		    ((mac[0] == 0x00) && (mac[1] == 0x00) &&
>>   		     (mac[2] == 0x00) && (mac[3] == 0x00) &&
>> -		     (mac[4] == 0x00) && (mac[5] == 0x00)) ||
>> -		     (!AutoloadFail)) {
>> +		     (mac[4] == 0x00) && (mac[5] == 0x00))) {
>>   			mac[0] = 0x00;
>>   			mac[1] = 0xe0;
>>   			mac[2] = 0x4c;
> 
> Hmm,
> 
> the whole r871xu_drv_init() looks odd, but it's unrelated.
> 
> I see that this patch does not help with below kernel path
> 
> r871xu_drv_init()
>     if (tmpU1b & _EEPROM_EN) <- true [1]
> 	if (!r8712_initmac || !mac_pton(r8712_initmac, mac)) <- (*)
> 		if ((!AutoloadFail) ||	<- false, since [1] branch taken
> 			[code touches stack data]
> 
> (*) false because of r8712_initmac is equal to NULL
> 

Oops, I am blind, ignore that one, please. The whole idea is wrong.

I need to go to sleep earlier today

sorry about that,


With regards,
Pavel Skripkin

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