linux-kernel - [PATCH] ipmi: use correct string length

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Date:   Mon, 8 Jan 2018 20:01:32 +0800
From:   Xiongfeng Wang <wangxiongfeng2@...wei.com>
To:     <minyard@....org>
CC:     <openipmi-developer@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <arnd@...db.de>,
        <wangxiongfeng2@...wei.com>
Subject: [PATCH] ipmi: use correct string length

From: Xiongfeng Wang <xiongfeng.wang@...aro.org>

gcc-8 reports

drivers/char/ipmi/ipmi_msghandler.c: In function
'panic_op_write_handler':
./include/linux/string.h:245:9: warning: '__builtin_strncpy' specified
bound 16 equals destination size [-Wstringop-truncation]

drivers/char/ipmi/ipmi_watchdog.c: In function 'set_param_str':
./include/linux/string.h:245:9: warning: '__builtin_strncpy' specified
bound 16 equals destination size [-Wstringop-truncation]

We need one less byte or call strlcpy() to make it a nul-terminated
string.

Signed-off-by: Xiongfeng Wang <xiongfeng.wang@...aro.org>
---
 drivers/char/ipmi/ipmi_msghandler.c | 2 +-
 drivers/char/ipmi/ipmi_watchdog.c   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index f45732a..01fbffb 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -84,7 +84,7 @@ static int panic_op_write_handler(const char *val,
 	char valcp[16];
 	char *s;
 
-	strncpy(valcp, val, 16);
+	strncpy(valcp, val, 15);
 	valcp[15] = '\0';
 
 	s = strstrip(valcp);
diff --git a/drivers/char/ipmi/ipmi_watchdog.c b/drivers/char/ipmi/ipmi_watchdog.c
index 76b2706..6004851 100644
--- a/drivers/char/ipmi/ipmi_watchdog.c
+++ b/drivers/char/ipmi/ipmi_watchdog.c
@@ -232,7 +232,7 @@ static int set_param_str(const char *val, const struct kernel_param *kp)
 	char       valcp[16];
 	char       *s;
 
-	strncpy(valcp, val, 16);
+	strncpy(valcp, val, 15);
 	valcp[15] = '\0';
 
 	s = strstrip(valcp);
-- 
1.8.3.1