diff mbox series

[v2,2/2] platform/x86: think-lmi: Clean up display of current_value on Thinkstation

Message ID 20230403013120.2105-2-mpearson-lenovo@squebb.ca
State New
Headers
Series [v2,1/2] platform/x86: think-lmi: Fix memory leaks when parsing ThinkStation WMI strings |

Commit Message

Mark Pearson April 3, 2023, 1:31 a.m. UTC 
  On ThinkStations on retrieving the attribute value the BIOS appends the
possible values to the string.
Clean up the display in the current_value_show function so the options
part is not displayed.

Fixes: a40cd7ef22fb ("platform/x86: think-lmi: Add WMI interface support on Lenovo platforms")
Reported by Mario Limoncello <Mario.Limonciello@amd.com>
Link: https://github.com/fwupd/fwupd/issues/5077#issuecomment-1488730526
Signed-off-by: Mark Pearson <mpearson-lenovo@squebb.ca>
---
Changes in v2: For some reason v2 doesn't apply cleanly so rebased and
started again. Hopefully this one works

 drivers/platform/x86/think-lmi.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

Comments

Mario Limonciello April 3, 2023, 2:05 a.m. UTC | #1 
On 4/2/23 20:31, Mark Pearson wrote:
> On ThinkStations on retrieving the attribute value the BIOS appends the
> possible values to the string.
> Clean up the display in the current_value_show function so the options
> part is not displayed.
>
> Fixes: a40cd7ef22fb ("platform/x86: think-lmi: Add WMI interface support on Lenovo platforms")
> Reported by Mario Limoncello <Mario.Limonciello@amd.com>
> Link: https://github.com/fwupd/fwupd/issues/5077#issuecomment-1488730526
> Signed-off-by: Mark Pearson <mpearson-lenovo@squebb.ca>
> ---
> Changes in v2: For some reason v2 doesn't apply cleanly so rebased and
> started again. Hopefully this one works

Tested-by: Mario Limonciello <mario.limonciello@amd.com>

tested on 6.3rc5 + prerequisite Armin's patch.

>
>   drivers/platform/x86/think-lmi.c | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
> index 87f832142d8d..78dc82bda4dd 100644
> --- a/drivers/platform/x86/think-lmi.c
> +++ b/drivers/platform/x86/think-lmi.c
> @@ -920,7 +920,7 @@ static ssize_t display_name_show(struct kobject *kobj, struct kobj_attribute *at
>   static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
>   {
>   	struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
> -	char *item, *value;
> +	char *item, *value, *p;
>   	int ret;
>   
>   	ret = tlmi_setting(setting->index, &item, LENOVO_BIOS_SETTING_GUID);
> @@ -931,9 +931,12 @@ static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *a
>   	value = strpbrk(item, ",");
>   	if (!value || value == item || !strlen(value + 1))
>   		ret = -EINVAL;
> -	else
> +	else {
> +		/* On Workstations remove the Options part after the value */
> +		p = strchrnul(value, ';');
> +		*p = '\0';
>   		ret = sysfs_emit(buf, "%s\n", value + 1);
> -
> +	}
>   	kfree(item);
>   
>   	return ret;
Mirsad Todorovac April 3, 2023, 8:21 a.m. UTC | #2 
On 3.4.2023. 3:31, Mark Pearson wrote:
> On ThinkStations on retrieving the attribute value the BIOS appends the
> possible values to the string.
> Clean up the display in the current_value_show function so the options
> part is not displayed.
> 
> Fixes: a40cd7ef22fb ("platform/x86: think-lmi: Add WMI interface support on Lenovo platforms")
> Reported by Mario Limoncello <Mario.Limonciello@amd.com>
> Link: https://github.com/fwupd/fwupd/issues/5077#issuecomment-1488730526
> Signed-off-by: Mark Pearson <mpearson-lenovo@squebb.ca>
> ---
> Changes in v2: For some reason v2 doesn't apply cleanly so rebased and
> started again. Hopefully this one works
> 
>   drivers/platform/x86/think-lmi.c | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
> index 87f832142d8d..78dc82bda4dd 100644
> --- a/drivers/platform/x86/think-lmi.c
> +++ b/drivers/platform/x86/think-lmi.c
> @@ -920,7 +920,7 @@ static ssize_t display_name_show(struct kobject *kobj, struct kobj_attribute *at
>   static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
>   {
>   	struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
> -	char *item, *value;
> +	char *item, *value, *p;
>   	int ret;
>   
>   	ret = tlmi_setting(setting->index, &item, LENOVO_BIOS_SETTING_GUID);
> @@ -931,9 +931,12 @@ static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *a
>   	value = strpbrk(item, ",");
>   	if (!value || value == item || !strlen(value + 1))
>   		ret = -EINVAL;
> -	else
> +	else {
> +		/* On Workstations remove the Options part after the value */
> +		p = strchrnul(value, ';');
> +		*p = '\0';
>   		ret = sysfs_emit(buf, "%s\n", value + 1);
> -
> +	}
>   	kfree(item);
>   
>   	return ret;

I can confirm the build against the Torvalds 6.3-rc5 tree and Armin's patch
applied w these.

[root@pc-mtodorov kernel]# uname -rms
Linux 6.3.0-rc5-mt-20230401-00005-g10de4cefccf7 x86_64
[root@pc-mtodorov kernel]# cat /sys/kernel/debug/kmemleak
[root@pc-mtodorov kernel]# echo scan > !$
echo scan > /sys/kernel/debug/kmemleak
[root@pc-mtodorov kernel]# cat /sys/kernel/debug/kmemleak
[root@pc-mtodorov kernel]# echo scan > /sys/kernel/debug/kmemleak
[root@pc-mtodorov kernel]# cat /sys/kernel/debug/kmemleak
[root@pc-mtodorov kernel]# echo scan > /sys/kernel/debug/kmemleak
[root@pc-mtodorov kernel]# cat /sys/kernel/debug/kmemleak
[root@pc-mtodorov kernel]#

The leak is apparently gone in the original setup that reproduced the leak.

At your convenience, you can please add

Tested-by: Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr>

Have a nice day.

Best regards,
Mirsad
diff mbox series

Patch

diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
index 87f832142d8d..78dc82bda4dd 100644
--- a/drivers/platform/x86/think-lmi.c
+++ b/drivers/platform/x86/think-lmi.c
@@ -920,7 +920,7 @@  static ssize_t display_name_show(struct kobject *kobj, struct kobj_attribute *at
 static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
 {
 	struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
-	char *item, *value;
+	char *item, *value, *p;
 	int ret;
 
 	ret = tlmi_setting(setting->index, &item, LENOVO_BIOS_SETTING_GUID);
@@ -931,9 +931,12 @@  static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *a
 	value = strpbrk(item, ",");
 	if (!value || value == item || !strlen(value + 1))
 		ret = -EINVAL;
-	else
+	else {
+		/* On Workstations remove the Options part after the value */
+		p = strchrnul(value, ';');
+		*p = '\0';
 		ret = sysfs_emit(buf, "%s\n", value + 1);
-
+	}
 	kfree(item);
 
 	return ret;