linux-kernel - [PATCH linux-next v2] parisc: use strscpy() to instead of strncpy()

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Message-ID: <202212261840048448622@zte.com.cn>
Date:   Mon, 26 Dec 2022 18:40:04 +0800 (CST)
From:   <yang.yang29@....com.cn>
To:     <james.bottomley@...senpartnership.com>
Cc:     <deller@....de>, <linux-parisc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <xu.panda@....com.cn>,
        <yang.yang29@....com.cn>
Subject: [PATCH linux-next v2] parisc: use strscpy() to instead of strncpy()

From: Xu Panda <xu.panda@....com.cn>

The implementation of strscpy() is more robust and safer.
That's now the recommended way to copy NUL-terminated strings.

Signed-off-by: Xu Panda <xu.panda@....com.cn>
Signed-off-by: Yang Yang <yang.yang29@....com>
---
change for v2
 - sizeof(in) is better and simplified, thanks for Helge Deller.
---
 drivers/parisc/pdc_stable.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/parisc/pdc_stable.c b/drivers/parisc/pdc_stable.c
index d6af5726ddf3..d3075445260b 100644
--- a/drivers/parisc/pdc_stable.c
+++ b/drivers/parisc/pdc_stable.c
@@ -274,8 +274,7 @@ pdcspath_hwpath_write(struct pdcspath_entry *entry, const char *buf, size_t coun

 	/* We'll use a local copy of buf */
 	count = min_t(size_t, count, sizeof(in)-1);
-	strncpy(in, buf, count);
-	in[count] = '\0';
+	strscpy(in, buf, sizeof(in));
 	
 	/* Let's clean up the target. 0xff is a blank pattern */
 	memset(&hwpath, 0xff, sizeof(hwpath));
@@ -388,8 +387,7 @@ pdcspath_layer_write(struct pdcspath_entry *entry, const char *buf, size_t count

 	/* We'll use a local copy of buf */
 	count = min_t(size_t, count, sizeof(in)-1);
-	strncpy(in, buf, count);
-	in[count] = '\0';
+	strscpy(in, buf, sizeof(in));
 	
 	/* Let's clean up the target. 0 is a blank pattern */
 	memset(&layers, 0, sizeof(layers));
@@ -756,8 +754,7 @@ static ssize_t pdcs_auto_write(struct kobject *kobj,

 	/* We'll use a local copy of buf */
 	count = min_t(size_t, count, sizeof(in)-1);
-	strncpy(in, buf, count);
-	in[count] = '\0';
+	strscpy(in, buf, sizeof(in));

 	/* Current flags are stored in primary boot path entry */
 	pathentry = &pdcspath_entry_primary;
-- 
2.15.2