linux-kernel - Re: [PATCH 5/6] kconfig: Don't leak help strings during parsing

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Date:   Thu, 11 Jan 2018 01:12:18 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Ulf Magnusson <ulfalizer@...il.com>
Cc:     "Yann E. MORIN" <yann.morin.1998@...e.fr>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Sam Ravnborg <sam@...nborg.org>, zippel@...ux-m68k.org,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        Michal Marek <michal.lkml@...kovi.net>, dirk@...ders.net,
        Arnaud Lacombe <lacombar@...il.com>, walch.martin@....de,
        Jan Beulich <JBeulich@...e.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/6] kconfig: Don't leak help strings during parsing

2017-10-09 2:11 GMT+09:00 Ulf Magnusson <ulfalizer@...il.com>:
> This is just for completeness to get rid of the last memory leak
> currently generated during parsing for ARCH=x86. The symbol
> DVB_NETUP_UNIDVB in drivers/media/pci/netup_unidvb/Kconfig currently has
> two help strings, and we leak the first one.

Looks like it was fixed by
561b29e4ec8d0aac7e094f70d649ee4abccdda03



> Summary from Valgrind on 'menuconfig' (ARCH=x86) before the fix:
>
>         LEAK SUMMARY:
>            definitely lost: 344,440 bytes in 14,350 blocks
>            ...
>
> Summary after the fix:
>
>         LEAK SUMMARY:
>            definitely lost: 344,376 bytes in 14,349 blocks
>            ...
>
> Signed-off-by: Ulf Magnusson <ulfalizer@...il.com>
> ---
>  scripts/kconfig/zconf.y | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/scripts/kconfig/zconf.y b/scripts/kconfig/zconf.y
> index 468ab03..3c9f436 100644
> --- a/scripts/kconfig/zconf.y
> +++ b/scripts/kconfig/zconf.y
> @@ -435,6 +435,9 @@ help_start: T_HELP T_EOL
>
>  help: help_start T_HELPTEXT
>  {
> +       if (current_entry->help)
> +               /* Weird menu node with two help strings */
> +               free(current_entry->help);
>         current_entry->help = $2;
>  };


I applied this, but maybe is it better to warning message?
         zconfprint("warning: ...")  or zconf_error()?


If you send v2, I will replace this.




-- 
Best Regards
Masahiro Yamada