Shreeya Patel <shreeya.patel@xxxxxxxxxxxxx> writes:
> 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)
> Signed-off-by: Shreeya Patel <shreeya.patel@xxxxxxxxxxxxx>
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> ---
>
> Changes in v3
> - Return error if strscpy() returns value < 0
>
> Changes in v2
> - Resolve warning of -Wstringop-truncation reported by
> kernel test robot.
>
> fs/unicode/utf8-core.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
Hi Shreeya,
Thanks for fixing this.
> diff --git a/fs/unicode/utf8-core.c b/fs/unicode/utf8-core.c
> index dc25823bf..706f086bb 100644
> --- a/fs/unicode/utf8-core.c
> +++ b/fs/unicode/utf8-core.c
> @@ -180,7 +180,10 @@ static int utf8_parse_version(const char *version, unsigned int *maj,
> {0, NULL}
> };
>
> - strncpy(version_string, version, sizeof(version_string));
> + int ret = strscpy(version_string, version, sizeof(version_string));
Usually, no spaces between variable declarations
Other than that,
Acked-by: Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxx>
> +
> + if (ret < 0)
> + return ret;
> if (match_token(version_string, token, args) != 1)
> return -EINVAL;
--
Gabriel Krisman Bertazi
