linux-kernel - Re: [PATCH v2 1/2] platform/x86: think-lmi: Fix memory leaks when parsing ThinkStation WMI strings

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Date:   Mon, 3 Apr 2023 11:43:31 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Mark Pearson <mpearson-lenovo@...ebb.ca>
Cc:     markgross@...nel.org, W_Armin@....de,
        mirsad.todorovac@....unizg.hr, linux@...ssschuh.net,
        Mario.Limonciello@....com, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] platform/x86: think-lmi: Fix memory leaks when
 parsing ThinkStation WMI strings

Hi,

On 4/3/23 03:31, Mark Pearson wrote:
> My previous commit introduced a memory leak where the item allocated
> from tlmi_setting was not freed.
> This commit also renames it to avoid confusion with the similarly name
> variable in the same function.
> 
> Fixes: 8a02d70679fc ("platform/x86: think-lmi: Add possible_values for ThinkStation")
> Reported-by: Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
> Link: https://lore.kernel.org/lkml/df26ff45-8933-f2b3-25f4-6ee51ccda7d8@gmx.de/T/
> Signed-off-by: Mark Pearson <mpearson-lenovo@...ebb.ca>
> ---
> This patch series builds on top of the proposed patch from Armin Wolf
> "platform/x86: think-lmi: Fix memory leak when showing current settings"
> Changes in v2: None, but rebased series because of issues with second
> patch.

Thank you for your patch series, I've applied this series
to my fixes branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=fixes

Note it will show up in my fixes branch once I've pushed my
local branch there, which might take a while.

I will include this series in my next fixes pull-req to Linus
for the current kernel development cycle.

Regards,

Hans




> 
>  drivers/platform/x86/think-lmi.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
> index 6034df6d577d..87f832142d8d 100644
> --- a/drivers/platform/x86/think-lmi.c
> +++ b/drivers/platform/x86/think-lmi.c
> @@ -1459,10 +1459,10 @@ static int tlmi_analyze(void)
>  			 * name string.
>  			 * Try and pull that out if it's available.
>  			 */
> -			char *item, *optstart, *optend;
> +			char *optitem, *optstart, *optend;
>  
> -			if (!tlmi_setting(setting->index, &item, LENOVO_BIOS_SETTING_GUID)) {
> -				optstart = strstr(item, "[Optional:");
> +			if (!tlmi_setting(setting->index, &optitem, LENOVO_BIOS_SETTING_GUID)) {
> +				optstart = strstr(optitem, "[Optional:");
>  				if (optstart) {
>  					optstart += strlen("[Optional:");
>  					optend = strstr(optstart, "]");
> @@ -1471,6 +1471,7 @@ static int tlmi_analyze(void)
>  							kstrndup(optstart, optend - optstart,
>  									GFP_KERNEL);
>  				}
> +				kfree(optitem);
>  			}
>  		}
>  		/*