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Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.9.0 Subject: Re: [PATCH] usb: cdnsp: Fixes error: uninitialized symbol 'len' Content-Language: en-US To: Greg KH , Pawel Laszczak Cc: peter.chen@kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20230331090600.454674-1-pawell@cadence.com> <2023040514-outspoken-librarian-3cde@gregkh> From: Oliver Neukum In-Reply-To: <2023040514-outspoken-librarian-3cde@gregkh> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: FR0P281CA0115.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:a8::14) To VI1PR04MB7104.eurprd04.prod.outlook.com (2603:10a6:800:126::9) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: VI1PR04MB7104:EE_|PAXPR04MB8958:EE_ X-MS-Office365-Filtering-Correlation-Id: 36458cae-bafd-41df-1b1d-08db35fd0c27 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:VI1PR04MB7104.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230028)(366004)(396003)(346002)(39860400002)(376002)(136003)(451199021)(83380400001)(86362001)(31696002)(36756003)(2906002)(31686004)(6486002)(478600001)(53546011)(186003)(2616005)(6512007)(6506007)(66946007)(66556008)(41300700001)(66476007)(4326008)(8936002)(8676002)(110136005)(316002)(5660300002)(38100700002)(43740500002)(45980500001);DIR:OUT;SFP:1101; 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>> - int ret = 0; >> + int ret = -EINVAL; >> u16 len; >> >> trace_cdnsp_ctrl_req(ctrl); >> @@ -424,7 +424,6 @@ void cdnsp_setup_analyze(struct cdnsp_device *pdev) >> >> if (pdev->gadget.state == USB_STATE_NOTATTACHED) { >> dev_err(pdev->dev, "ERR: Setup detected in unattached state\n"); >> - ret = -EINVAL; > > That's a nice change, but I don't see the original error here that you > are saying this change fixes. > > What am I missing? The function has this check at its beginning: if (!pdev->gadget_driver) goto out; ret is initialized to 0 and len is uninitialized. The jump goes to: out: if (ret < 0) cdnsp_ep0_stall(pdev); else if (!len && pdev->ep0_stage != CDNSP_STATUS_STAGE) cdnsp_status_stage(pdev); The compiler (and an analysis tool) can determine that len will be evaluated in an uninitialized state. Setting ret to something negative prevents that. I must say this is convoluted, even though it is correct. HTH Oliver