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Thu, 6 Jan 2022 10:05:48 +0000 Date: Thu, 6 Jan 2022 13:05:31 +0300 From: Dan Carpenter To: paskripkin@gmail.com Cc: kernel-janitors@vger.kernel.org Subject: [bug report] asix: fix uninit-value in asix_mdio_read() Message-ID: <20220106100531.GA25074@kili> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) X-ClientProxiedBy: ZR0P278CA0112.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:20::9) To MWHPR1001MB2365.namprd10.prod.outlook.com (2603:10b6:301:2d::28) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: db76c775-5f2f-45a7-ffba-08d9d0fc1cca X-MS-TrafficTypeDiagnostic: MWHPR1001MB2367:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8273; 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:MWHPR1001MB2365.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(7916004)(366004)(6916009)(1076003)(6666004)(33656002)(44832011)(6506007)(33716001)(316002)(52116002)(9686003)(6512007)(2906002)(83380400001)(6486002)(508600001)(38100700002)(8676002)(186003)(38350700002)(4326008)(5660300002)(26005)(8936002)(66946007)(86362001)(66556008)(66476007);DIR:OUT;SFP:1101; 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71 u8 smsr; 72 73 for (i = 0; i < AX_HOST_EN_RETRIES; ++i) { 74 ret = asix_set_sw_mii(dev, in_pm); 75 if (ret == -ENODEV || ret == -ETIMEDOUT) 76 break; 77 usleep_range(1000, 1100); 78 ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG, 79 0, 0, 1, &smsr, in_pm); 80 if (ret == -ENODEV) 81 break; --> 82 else if (ret < sizeof(smsr)) This has to be: if (ret < 0 || ret < sizeof(smsr)) { but even better would be to fix asix_read_cmd() to not allow partial reads. It should print the netdev_warn() for partial reads but right now it doesn't. 83 continue; 84 else if (smsr & AX_HOST_EN) 85 break; 86 } 87 88 return i >= AX_HOST_EN_RETRIES ? -ETIMEDOUT : ret; 89 } regards, dan carpenter