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Thu, 16 Sep 2021 13:14:05 +0000 Date: Thu, 16 Sep 2021 16:13:42 +0300 From: Dan Carpenter To: Zhang Rui Cc: Daniel Lezcano , Amit Kucheria , Eduardo Valentin , linux-pm@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH] thermal/core: Potential buffer overflow in thermal_build_list_of_policies() Message-ID: <20210916131342.GB25094@kili> Content-Disposition: inline X-Mailer: git-send-email haha only kidding User-Agent: Mutt/1.10.1 (2018-07-13) X-ClientProxiedBy: PR1P264CA0012.FRAP264.PROD.OUTLOOK.COM (2603:10a6:102:19e::17) To MWHPR1001MB2365.namprd10.prod.outlook.com (2603:10b6:301:2d::28) MIME-Version: 1.0 Received: from kili (62.8.83.99) by PR1P264CA0012.FRAP264.PROD.OUTLOOK.COM (2603:10a6:102:19e::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4523.14 via Frontend Transport; Thu, 16 Sep 2021 13:14:01 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 6c7f3021-72e5-4985-abb8-08d97913dbce X-MS-TrafficTypeDiagnostic: MWHPR1001MB2159: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:288; 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The problem is that "size" has not been updated after printing the last governor. This means that it can write one character (the NUL terminator) beyond the end of the buffer. Get rid of the "size" variable and just use "PAGE_SIZE - count" directly. Fixes: 1b4f48494eb2 ("thermal: core: group functions related to governor handling") Signed-off-by: Dan Carpenter --- drivers/thermal/thermal_core.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index 97ef9b040b84..51374f4e1cca 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -222,15 +222,14 @@ int thermal_build_list_of_policies(char *buf) { struct thermal_governor *pos; ssize_t count = 0; - ssize_t size = PAGE_SIZE; mutex_lock(&thermal_governor_lock); list_for_each_entry(pos, &thermal_governor_list, governor_list) { - size = PAGE_SIZE - count; - count += scnprintf(buf + count, size, "%s ", pos->name); + count += scnprintf(buf + count, PAGE_SIZE - count, "%s ", + pos->name); } - count += scnprintf(buf + count, size, "\n"); + count += scnprintf(buf + count, PAGE_SIZE - count, "\n"); mutex_unlock(&thermal_governor_lock);