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

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Date:   Sun, 2 Apr 2023 09:04:28 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Mark Pearson <mpearson-lenovo@...ebb.ca>
Cc:     hdegoede@...hat.com, markgross@...nel.org, W_Armin@....de,
        mirsad.todorovac@....unizg.hr, linux@...ssschuh.net,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] platform/x86: think-lmi: Fix memory leaks when
 parsing ThinkStation WMI strings

On 4/1/23 13:43, 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"

Which version of the patch did you do it from?  I tried to apply v3 of 
Armin's patch
to Linus' tree and then apply these two.

The first applied, but the second had conflicts.  Here was my base (with 
patch 1 in
this series applied).

50c77e3211d7 (HEAD -> master) platform/x86: think-lmi: Fix memory leaks 
when parsing ThinkStation WMI strings
ede629af1e2c platform/x86: think-lmi: Fix memory leak when showing 
current settings
00c7b5f4ddc5 (origin/master, origin/HEAD) Merge tag 'input-for-v6.3-rc4' 
of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

......

Applying: platform/x86: think-lmi: Clean up display of current_value on 
Thinkstation
error: patch failed: drivers/platform/x86/think-lmi.c:931
error: drivers/platform/x86/think-lmi.c: patch does not apply

>   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 88da7bcb6ce9..ad952b49617b 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);
>   			}
>   		}
>   		/*