linux-kernel - Re: [PATCH v4 02/10] kunit: string-stream: Don't create a fragment for empty strings

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 15 Aug 2023 17:16:04 +0800
From:   David Gow <davidgow@...gle.com>
To:     Richard Fitzgerald <rf@...nsource.cirrus.com>
Cc:     brendan.higgins@...ux.dev, rmoar@...gle.com,
        linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, patches@...nsource.cirrus.com
Subject: Re: [PATCH v4 02/10] kunit: string-stream: Don't create a fragment
 for empty strings

On Mon, 14 Aug 2023 at 21:23, Richard Fitzgerald
<rf@...nsource.cirrus.com> wrote:
>
> If the result of the formatted string is an empty string just return
> instead of creating an empty fragment.
>
> Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
> ---

Nice catch!

Reviewed-by: David Gow <davidgow@...gle.com>

Cheers,
-- David


>  lib/kunit/string-stream.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/lib/kunit/string-stream.c b/lib/kunit/string-stream.c
> index cc32743c1171..ed24d86af9f5 100644
> --- a/lib/kunit/string-stream.c
> +++ b/lib/kunit/string-stream.c
> @@ -50,11 +50,17 @@ int string_stream_vadd(struct string_stream *stream,
>         /* Make a copy because `vsnprintf` could change it */
>         va_copy(args_for_counting, args);
>
> -       /* Need space for null byte. */
> -       len = vsnprintf(NULL, 0, fmt, args_for_counting) + 1;
> +       /* Evaluate length of formatted string */
> +       len = vsnprintf(NULL, 0, fmt, args_for_counting);
>
>         va_end(args_for_counting);
>
> +       if (len == 0)
> +               return 0;
> +
> +       /* Need space for null byte. */
> +       len++;
> +
>         frag_container = alloc_string_stream_fragment(stream->test,
>                                                       len,
>                                                       stream->gfp);
> --
> 2.30.2
>

Download attachment "smime.p7s" of type "application/pkcs7-signature" (4003 bytes)