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Linville" , linux-wireless@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH 1/2] wil6210: debugfs: fix info leak in wil_write_file_wmi() Message-ID: Content-Disposition: inline X-Mailer: git-send-email haha only kidding X-ClientProxiedBy: ZR0P278CA0174.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:45::20) 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: 7c99d74e-89fc-4500-7253-08da5f1c8ee7 X-MS-TrafficTypeDiagnostic: CO1PR10MB4642:EE_ 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:(13230016)(7916004)(136003)(346002)(376002)(396003)(366004)(39860400002)(478600001)(38100700002)(38350700002)(6486002)(186003)(6506007)(41300700001)(6666004)(52116002)(110136005)(2906002)(66556008)(316002)(54906003)(8936002)(5660300002)(44832011)(86362001)(6512007)(26005)(9686003)(83380400001)(66946007)(66476007)(33716001)(4326008)(8676002);DIR:OUT;SFP:1101; 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However we need to initialize the whole buffer to prevent information leaks. Just use memdup_user(). Fixes: ff974e408334 ("wil6210: debugfs interface to send raw WMI command") Signed-off-by: Dan Carpenter --- drivers/net/wireless/ath/wil6210/debugfs.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) diff --git a/drivers/net/wireless/ath/wil6210/debugfs.c b/drivers/net/wireless/ath/wil6210/debugfs.c index 64d6c98174c8..fe84362718de 100644 --- a/drivers/net/wireless/ath/wil6210/debugfs.c +++ b/drivers/net/wireless/ath/wil6210/debugfs.c @@ -1012,18 +1012,12 @@ static ssize_t wil_write_file_wmi(struct file *file, const char __user *buf, u16 cmdid; int rc, rc1; - if (cmdlen < 0) + if (cmdlen < 0 || *ppos != 0) return -EINVAL; - wmi = kmalloc(len, GFP_KERNEL); - if (!wmi) - return -ENOMEM; - - rc = simple_write_to_buffer(wmi, len, ppos, buf, len); - if (rc < 0) { - kfree(wmi); - return rc; - } + wmi = memdup_user(buf, len); + if (IS_ERR(wmi)) + return PTR_ERR(wmi); cmd = (cmdlen > 0) ? &wmi[1] : NULL; cmdid = le16_to_cpu(wmi->command_id); From patchwork Wed Jul 6 06:57:57 2022 Content-Type: text/plain; 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In particular it will fail if "*ppos != 0". Although this code works, it is more complicated than necessary. Just use strndup_user() instead. Signed-off-by: Dan Carpenter --- drivers/net/wireless/ath/wil6210/debugfs.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/drivers/net/wireless/ath/wil6210/debugfs.c b/drivers/net/wireless/ath/wil6210/debugfs.c index fe84362718de..591ba7f61c64 100644 --- a/drivers/net/wireless/ath/wil6210/debugfs.c +++ b/drivers/net/wireless/ath/wil6210/debugfs.c @@ -1937,18 +1937,15 @@ static ssize_t wil_link_stats_write(struct file *file, const char __user *buf, struct wil6210_priv *wil = s->private; int cid, interval, rc, i; struct wil6210_vif *vif; - char *kbuf = kmalloc(len + 1, GFP_KERNEL); + char *kbuf; - if (!kbuf) - return -ENOMEM; + if (*ppos != 0) + return -EINVAL; - rc = simple_write_to_buffer(kbuf, len, ppos, buf, len); - if (rc != len) { - kfree(kbuf); - return rc >= 0 ? -EIO : rc; - } + kbuf = strndup_user(buf, len + 1); + if (IS_ERR(kbuf)) + return -ENOMEM; - kbuf[len] = '\0'; /* specify cid (use -1 for all cids) and snapshot interval in ms */ rc = sscanf(kbuf, "%d %d", &cid, &interval); kfree(kbuf);