linux-kernel - [PATCH v2 3/4] fs: unicode: Use strscpy() instead of strncpy()

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Message-Id: <20210318133305.316564-4-shreeya.patel@collabora.com>
Date:   Thu, 18 Mar 2021 19:03:04 +0530
From:   Shreeya Patel <shreeya.patel@...labora.com>
To:     krisman@...labora.com, jaegeuk@...nel.org, yuchao0@...wei.com,
        tytso@....edu, adilger.kernel@...ger.ca, drosen@...gle.com,
        ebiggers@...gle.com
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        kernel@...labora.com, andre.almeida@...labora.com,
        Shreeya Patel <shreeya.patel@...labora.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH v2 3/4] fs: unicode: Use strscpy() instead of strncpy()

Following warning was reported by Kernel Test Robot.

In function 'utf8_parse_version',
inlined from 'utf8_load' at fs/unicode/utf8mod.c:195:7:
>> fs/unicode/utf8mod.c:175:2: warning: 'strncpy' specified bound 12 equals
destination size [-Wstringop-truncation]
175 |  strncpy(version_string, version, sizeof(version_string));
    |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The -Wstringop-truncation warning highlights the unintended
uses of the strncpy function that truncate the terminating NULL
character from the source string.
Unlike strncpy(), strscpy() always null-terminates the destination string,
hence use strscpy() instead of strncpy().

Signed-off-by: Shreeya Patel <shreeya.patel@...labora.com>
Reported-by: kernel test robot <lkp@...el.com>
---
Changes in v2
  - Resolve warning of -Wstringop-truncation reported by
    kernel test robot.

 fs/unicode/unicode-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/unicode/unicode-core.c b/fs/unicode/unicode-core.c
index d5f09e022ac5..287a8a48836c 100644
--- a/fs/unicode/unicode-core.c
+++ b/fs/unicode/unicode-core.c
@@ -179,7 +179,7 @@ static int unicode_parse_version(const char *version, unsigned int *maj,
 		{0, NULL}
 	};
 
-	strncpy(version_string, version, sizeof(version_string));
+	strscpy(version_string, version, sizeof(version_string));
 
 	if (match_token(version_string, token, args) != 1)
 		return -EINVAL;
-- 
2.30.1