linux-kernel - Re: [PATCH next] media: i2c: fix error handling in ub960_rxport_add

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Message-ID: <ba1652bb-4bf1-95c0-683e-474d07edad75@oracle.com>
Date:   Tue, 18 Jul 2023 19:08:48 +0530
From:   Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To:     Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     dan.carpenter@...aro.org, kernel-janitors@...r.kernel.org,
        error27@...il.com
Subject: Re: [PATCH next] media: i2c: fix error handling in
 ub960_rxport_add_serializer()

Hi Tomi,

On 18/07/23 7:01 pm, Tomi Valkeinen wrote:
> Hi,
> 
> On 18/07/2023 11:58, Harshit Mogalapalli wrote:
>> Smatch warns:
>>   drivers/media/i2c/ds90ub960.c:1671 ub960_rxport_add_serializer():
>>   err: 'rxport->ser.client' dereferencing possible ERR_PTR()
>>
>> i2c_new_client_device() returns error pointers on failure and in
>> dev_dbg statement we are dereferencing error pointer which is a bug.
>>
>> Fix this by using IS_ERR() which checks for error pointers.
>>
>> Fixes: afe267f2d368 ("media: i2c: add DS90UB960 driver")
>> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
>> ---
>> Found with static analysis, only compile tested. Although in
>> drivers/media i2c_client_has_driver() checks are present, IS_ERR() would
>> probably be sufficient here.
>> ---
>>   drivers/media/i2c/ds90ub960.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/media/i2c/ds90ub960.c 
>> b/drivers/media/i2c/ds90ub960.c
>> index e101bcf2356a..88144e3ec183 100644
>> --- a/drivers/media/i2c/ds90ub960.c
>> +++ b/drivers/media/i2c/ds90ub960.c
>> @@ -1662,7 +1662,7 @@ static int ub960_rxport_add_serializer(struct 
>> ub960_data *priv, u8 nport)
>>       ser_info.addr = rxport->ser.alias;
>>       rxport->ser.client =
>>           i2c_new_client_device(priv->client->adapter, &ser_info);
>> -    if (!rxport->ser.client) {
>> +    if (IS_ERR(rxport->ser.client)) {
>>           dev_err(dev, "rx%u: cannot add %s i2c device", nport,
>>               ser_info.type);
>>           return -EIO;
> 
> Good catch. I think this should be modified to return 
> PTR_ERR(rxport->ser.client) instead of -EIO. Do you want to update the 
> patch or shall I do the change?

Thanks,

I think it is easier for me to do that change PTR_ERR change. Will send 
V2 with that change added.

Regards,
Harshit

> 
>   Tomi
>