[PATCH v1] selftests: ktap_helpers: Fix uninitialized variable

[Mickaël Salaün]

On Wed, Nov 27, 2024 at 05:03:40PM +0100, Mickaël Salaün wrote:
> __ktap_test() may be called without the optional third argument which is
> an issue for scripts using `set -u` to detect uninitialized variables
> and potential bugs.
> 
> Fix this optional "directive" argument by either using the third
> argument or an empty string.
> 
> This was discovered while developing tests for script control execution:
> https://lore.kernel.org/r/20241112191858.162021-7-mic@digikod.net
> 
> Cc: Kees Cook <kees at kernel.org>
> Cc: Nícolas F. R. A. Prado <nfraprado at collabora.com>
> Cc: Shuah Khan <skhan at linuxfoundation.org>

Please add this missing tag:

Fixes: 14571ab1ad21 ("kselftest: Add new test for detecting unprobed Devicetree devices")

> Signed-off-by: Mickaël Salaün <mic at digikod.net>
> ---
>  tools/testing/selftests/kselftest/ktap_helpers.sh | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/kselftest/ktap_helpers.sh b/tools/testing/selftests/kselftest/ktap_helpers.sh
> index 79a125eb24c2..14e7f3ec3f84 100644
> --- a/tools/testing/selftests/kselftest/ktap_helpers.sh
> +++ b/tools/testing/selftests/kselftest/ktap_helpers.sh
> @@ -40,7 +40,7 @@ ktap_skip_all() {
>  __ktap_test() {
>  	result="$1"
>  	description="$2"
> -	directive="$3" # optional
> +	directive="${3:-}" # optional
>  
>  	local directive_str=
>  	[ ! -z "$directive" ] && directive_str="# $directive"
> -- 
> 2.47.1
> 
>