linux-kernel - Re: [PATCH RESEND] kunit: string-stream: Allow ERR_PTR to be passed to string_stream

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Date:   Thu, 30 Nov 2023 15:51:36 -0500
From:   Rae Moar <rmoar@...gle.com>
To:     Richard Fitzgerald <rf@...nsource.cirrus.com>
Cc:     brendan.higgins@...ux.dev, davidgow@...gle.com,
        linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, patches@...nsource.cirrus.com
Subject: Re: [PATCH RESEND] kunit: string-stream: Allow ERR_PTR to be passed
 to string_stream_destroy()

On Mon, Oct 30, 2023 at 6:47 AM Richard Fitzgerald
<rf@...nsource.cirrus.com> wrote:
>
> Check the stream pointer passed to string_stream_destroy() for
> IS_ERR_OR_NULL() instead of only NULL.
>
> Whatever alloc_string_stream() returns should be safe to pass
> to string_stream_destroy(), and that will be an ERR_PTR.
>
> It's obviously good practise and generally helpful to also check
> for NULL pointers so that client cleanup code can call
> string_stream_destroy() unconditionally - which could include
> pointers that have never been set to anything and so are NULL.
>
> Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>

Hello!

Sorry for the delay in reviewing this patch but this looks good to me!

Reviewed-by: Rae Moar <rmoar@...gle.com>

Thanks!
-Rae

> ---
>  lib/kunit/string-stream.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/lib/kunit/string-stream.c b/lib/kunit/string-stream.c
> index a6f3616c2048..54f4fdcbfac8 100644
> --- a/lib/kunit/string-stream.c
> +++ b/lib/kunit/string-stream.c
> @@ -173,7 +173,7 @@ void string_stream_destroy(struct string_stream *stream)
>  {
>         KUNIT_STATIC_STUB_REDIRECT(string_stream_destroy, stream);
>
> -       if (!stream)
> +       if (IS_ERR_OR_NULL(stream))
>                 return;
>
>         string_stream_clear(stream);
> --
> 2.30.2
>