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Thu, 16 Sep 2021 13:22:06 +0000 Date: Thu, 16 Sep 2021 16:21:54 +0300 From: Dan Carpenter To: Jiri Kosina Cc: Benjamin Tissoires , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH] HID: hid-debug: clean up snprintf() checks in hid_resolv_usage() Message-ID: <20210916132154.GC25094@kili> Content-Disposition: inline X-Mailer: git-send-email haha only kidding User-Agent: Mutt/1.10.1 (2018-07-13) X-ClientProxiedBy: ZRAP278CA0017.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:10::27) To MWHPR1001MB2365.namprd10.prod.outlook.com (2603:10b6:301:2d::28) MIME-Version: 1.0 Received: from kili (62.8.83.99) by ZRAP278CA0017.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:10::27) 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 13:22:03 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 440e7424-5882-457b-970e-08d97914fae1 X-MS-TrafficTypeDiagnostic: MWHPR10MB1615: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8273; 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It means we can't use the last byte of the buffer. If we change the first snprintf() to scnprintf() then we can remove the max(). At the start of the function the strlen(buf) is going always going to be < HID_DEBUG_BUFSIZE so that is safe. If it were > HID_DEBUG_BUFSIZE then that would result in a WARN(). Signed-off-by: Dan Carpenter --- drivers/hid/hid-debug.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/drivers/hid/hid-debug.c b/drivers/hid/hid-debug.c index fa57d05badf7..3f62fe3b0a49 100644 --- a/drivers/hid/hid-debug.c +++ b/drivers/hid/hid-debug.c @@ -486,8 +486,7 @@ char *hid_resolv_usage(unsigned usage, struct seq_file *f) { if (!f) { len = strlen(buf); - snprintf(buf+len, max(0, HID_DEBUG_BUFSIZE - len), "."); - len++; + len += scnprintf(buf + len, HID_DEBUG_BUFSIZE - len, "."); } else { seq_printf(f, "."); @@ -498,7 +497,7 @@ char *hid_resolv_usage(unsigned usage, struct seq_file *f) { if (p->usage == (usage & 0xffff)) { if (!f) snprintf(buf + len, - max(0,HID_DEBUG_BUFSIZE - len - 1), + HID_DEBUG_BUFSIZE - len, "%s", p->description); else seq_printf(f, @@ -509,8 +508,8 @@ char *hid_resolv_usage(unsigned usage, struct seq_file *f) { break; } if (!f) - snprintf(buf + len, max(0, HID_DEBUG_BUFSIZE - len - 1), - "%04x", usage & 0xffff); + snprintf(buf + len, HID_DEBUG_BUFSIZE - len, "%04x", + usage & 0xffff); else seq_printf(f, "%04x", usage & 0xffff); return buf;