Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Subject: Re: [PATCH] usb: phy: phy-tahvo: fix memory leak in tahvo_usb_probe()
From:   Sergey Shtylyov <s.shtylyov@omp.ru>
To:     Li Yang <lidaxian@hust.edu.cn>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Felipe Balbi <balbi@kernel.org>
CC:     Dongliang Mu <dzm91@hust.edu.cn>, <linux-usb@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
References: <20230418090758.18756-1-lidaxian@hust.edu.cn>
 <96c7edf5-e1cc-03f6-ee52-ef373ae9d820@omp.ru>
Organization: Open Mobile Platform
Message-ID: <eb33b694-b422-a9d5-35dc-2f8af79d47f1@omp.ru>
Date:   Wed, 19 Apr 2023 12:00:32 +0300
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101
 Thunderbird/78.10.1
MIME-Version: 1.0
In-Reply-To: <96c7edf5-e1cc-03f6-ee52-ef373ae9d820@omp.ru>
Content-Type: text/plain; charset="utf-8"
Content-Language: en-US
Content-Transfer-Encoding: 7bit
X-KSE-Attachment-Filter-Triggered-Filters: Clean
X-KSE-BulkMessagesFiltering-Scan-Result: InTheLimit
X-Spam-Status: No, score=-4.5 required=5.0 tests=BAYES_00,NICE_REPLY_A,
        SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham
        autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On 4/18/23 2:17 PM, Sergey Shtylyov wrote:
[...]
>> Smatch reports:
>> drivers/usb/phy/phy-tahvo.c: tahvo_usb_probe()
>> warn: missing unwind goto?
>>
>> After geting irq, if ret < 0, it will return without error handling to
>> free memory.
>> Just add error handling to fix this problem.
> 
>    Oops, I'm sorry for missing that one...
> 
>> Fixes: 0d45a1373e66 ("usb: phy: tahvo: add IRQ check")
>> Signed-off-by: Li Yang <lidaxian@hust.edu.cn>
>> Reviewed-by: Dongliang Mu <dzm91@hust.edu.cn>
>> ---
>> The issue is found by static analysis, and the patch remains untest.
>> ---
>>  drivers/usb/phy/phy-tahvo.c | 7 +++++--
>>  1 file changed, 5 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/usb/phy/phy-tahvo.c b/drivers/usb/phy/phy-tahvo.c
>> index f2d2cc586c5b..184a5f3d7473 100644
>> --- a/drivers/usb/phy/phy-tahvo.c
>> +++ b/drivers/usb/phy/phy-tahvo.c
>> @@ -390,8 +390,11 @@ static int tahvo_usb_probe(struct platform_device *pdev)
>>  	dev_set_drvdata(&pdev->dev, tu);
>>  
>>  	tu->irq = ret = platform_get_irq(pdev, 0);
>> -	if (ret < 0)
>> -		return ret;
>> +	if (ret < 0) {
>> +		dev_err(&pdev->dev, "could not get irq: %d\n",
>> +				ret);
> 
>    Adding the error message needs another patch, strictly speaking...

   And if you look at platform_get_irq(), you'll see that it prints an error msg
itself...

[...]

MBR, Sergey