linux-kernel - [PATCH v3 -next] staging: fbtft: fix strncmp() size warning

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20181218142821.7484-1-yuehaibing@huawei.com>
Date:   Tue, 18 Dec 2018 22:28:21 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <devel@...verdev.osuosl.org>, <gregkh@...uxfoundation.org>,
        <leobras.c@...il.co>, <radek.dostal@...eamunlimited.co>
CC:     <linux-kernel@...r.kernel.org>, <linux-fbdev@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH v3 -next] staging: fbtft: fix strncmp() size warning

strncmp() stops comparing when either the end of one of the first two
arguments is reached or when 'n' characters have been compared, whichever
comes first.That means that strncmp(s1, s2, n) is equivalent to
strcmp(s1, s2) if n exceeds the length of s1 or the length of s2.

This patch avoids that the following warning is reported by smatch:

drivers/staging/fbtft/fbtft_device.c:1458
 fbtft_device_init() error: strncmp() '"list"' too small (5 vs 32)

Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
v2-v3: fix messed patch title
---
 drivers/staging/fbtft/fbtft_device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/fbtft/fbtft_device.c b/drivers/staging/fbtft/fbtft_device.c
index 50e97da..046f9d3 100644
--- a/drivers/staging/fbtft/fbtft_device.c
+++ b/drivers/staging/fbtft/fbtft_device.c
@@ -1455,7 +1455,7 @@ static int __init fbtft_device_init(void)
 	}
 
 	/* name=list lists all supported displays */
-	if (strncmp(name, "list", FBTFT_GPIO_NAME_SIZE) == 0) {
+	if (strcmp(name, "list") == 0) {
 		pr_info("Supported displays:\n");
 
 		for (i = 0; i < ARRAY_SIZE(displays); i++)
-- 
2.7.0