* [PATCH 1/1] cpuidle: fix improper return value on error
@ 2016-12-03 15:02 Pan Bian
2016-12-08 0:13 ` Rafael J. Wysocki
0 siblings, 1 reply; 2+ messages in thread
From: Pan Bian @ 2016-12-03 15:02 UTC (permalink / raw)
To: Rafael J. Wysocki, Daniel Lezcano, linux-pm; +Cc: linux-kernel, Pan Bian
From: Pan Bian <bianpan2016@163.com>
In function cpuidle_add_state_sysfs(), variable ret takes the return
value. Its value should be negative on errors. Because ret is reset in
the loop, its value will be 0 during the second and after repeat of the
loop. If kzalloc() returns a NULL pointer then, it will return 0. It may
be better to explicitly assign "-ENOMEM" when the call to kzalloc()
fails.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=188901
Signed-off-by: Pan Bian <bianpan2016@163.com>
---
drivers/cpuidle/sysfs.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c
index 832a2c3..c5adc8c 100644
--- a/drivers/cpuidle/sysfs.c
+++ b/drivers/cpuidle/sysfs.c
@@ -403,8 +403,10 @@ static int cpuidle_add_state_sysfs(struct cpuidle_device *device)
/* state statistics */
for (i = 0; i < drv->state_count; i++) {
kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
- if (!kobj)
+ if (!kobj) {
+ ret = -ENOMEM;
goto error_state;
+ }
kobj->state = &drv->states[i];
kobj->state_usage = &device->states_usage[i];
init_completion(&kobj->kobj_unregister);
--
1.9.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH 1/1] cpuidle: fix improper return value on error
2016-12-03 15:02 [PATCH 1/1] cpuidle: fix improper return value on error Pan Bian
@ 2016-12-08 0:13 ` Rafael J. Wysocki
0 siblings, 0 replies; 2+ messages in thread
From: Rafael J. Wysocki @ 2016-12-08 0:13 UTC (permalink / raw)
To: Pan Bian; +Cc: Daniel Lezcano, linux-pm, linux-kernel, Pan Bian
On Saturday, December 03, 2016 11:02:27 PM Pan Bian wrote:
> From: Pan Bian <bianpan2016@163.com>
>
> In function cpuidle_add_state_sysfs(), variable ret takes the return
> value. Its value should be negative on errors. Because ret is reset in
> the loop, its value will be 0 during the second and after repeat of the
> loop. If kzalloc() returns a NULL pointer then, it will return 0. It may
> be better to explicitly assign "-ENOMEM" when the call to kzalloc()
> fails.
>
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=188901
>
> Signed-off-by: Pan Bian <bianpan2016@163.com>
> ---
> drivers/cpuidle/sysfs.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c
> index 832a2c3..c5adc8c 100644
> --- a/drivers/cpuidle/sysfs.c
> +++ b/drivers/cpuidle/sysfs.c
> @@ -403,8 +403,10 @@ static int cpuidle_add_state_sysfs(struct cpuidle_device *device)
> /* state statistics */
> for (i = 0; i < drv->state_count; i++) {
> kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
> - if (!kobj)
> + if (!kobj) {
> + ret = -ENOMEM;
> goto error_state;
> + }
> kobj->state = &drv->states[i];
> kobj->state_usage = &device->states_usage[i];
> init_completion(&kobj->kobj_unregister);
>
Applied.
Thanks,
Rafael
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2016-12-08 0:13 ` Rafael J. Wysocki
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