linux-ext4 - [PATCH v6 1/4] fs: unicode: Use strscpy() instead of strncpy()

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Message-Id: <20210331210751.281645-2-shreeya.patel@collabora.com>
Date:   Thu,  1 Apr 2021 02:37:48 +0530
From:   Shreeya Patel <shreeya.patel@...labora.com>
To:     tytso@....edu, adilger.kernel@...ger.ca, jaegeuk@...nel.org,
        chao@...nel.org, krisman@...labora.com, ebiggers@...gle.com,
        drosen@...gle.com, ebiggers@...nel.org, yuchao0@...wei.com
Cc:     linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, kernel@...labora.com,
        andre.almeida@...labora.com, kernel test robot <lkp@...el.com>
Subject: [PATCH v6 1/4] 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().

Fixes: 9d53690f0d4e5 (unicode: implement higher level API for string handling)
Acked-by: Gabriel Krisman Bertazi <krisman@...labora.com>
Signed-off-by: Shreeya Patel <shreeya.patel@...labora.com>
Reported-by: kernel test robot <lkp@...el.com>
---
 fs/unicode/utf8-core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/unicode/utf8-core.c b/fs/unicode/utf8-core.c
index dc25823bfed9..f9e6a2718aba 100644
--- a/fs/unicode/utf8-core.c
+++ b/fs/unicode/utf8-core.c
@@ -179,8 +179,10 @@ static int utf8_parse_version(const char *version, unsigned int *maj,
 		{1, "%d.%d.%d"},
 		{0, NULL}
 	};
+	int ret = strscpy(version_string, version, sizeof(version_string));
 
-	strncpy(version_string, version, sizeof(version_string));
+	if (ret < 0)
+		return ret;
 
 	if (match_token(version_string, token, args) != 1)
 		return -EINVAL;
-- 
2.30.2