linux-kernel - Re: [PATCH 038/190] Revert "cpuidle: Fix three reference count leaks"

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Date:   Wed, 21 Apr 2021 19:53:46 +0200
From:   "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     Qiushi Wu <wu000273@....edu>
Subject: Re: [PATCH 038/190] Revert "cpuidle: Fix three reference count leaks"

On 4/21/2021 2:58 PM, Greg Kroah-Hartman wrote:
> This reverts commit c343bf1ba5efcbf2266a1fe3baefec9cc82f867f.
>
> Commits from @umn.edu addresses have been found to be submitted in "bad
> faith" to try to test the kernel community's ability to review "known
> malicious" changes.  The result of these submissions can be found in a
> paper published at the 42nd IEEE Symposium on Security and Privacy
> entitled, "Open Source Insecurity: Stealthily Introducing
> Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
> of Minnesota) and Kangjie Lu (University of Minnesota).
>
> Because of this, all submissions from this group must be reverted from
> the kernel tree and will need to be re-reviewed again to determine if
> they actually are a valid fix.  Until that work is complete, remove this
> change to ensure that no problems are being introduced into the
> codebase.
>
> Cc: Qiushi Wu <wu000273@....edu>
> Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>


> ---
>   drivers/cpuidle/sysfs.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c
> index 53ec9585ccd4..23a219cedbdb 100644
> --- a/drivers/cpuidle/sysfs.c
> +++ b/drivers/cpuidle/sysfs.c
> @@ -487,7 +487,7 @@ static int cpuidle_add_state_sysfs(struct cpuidle_device *device)
>   		ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle,
>   					   &kdev->kobj, "state%d", i);
>   		if (ret) {
> -			kobject_put(&kobj->kobj);
> +			kfree(kobj);
>   			goto error_state;
>   		}
>   		cpuidle_add_s2idle_attr_group(kobj);
> @@ -618,7 +618,7 @@ static int cpuidle_add_driver_sysfs(struct cpuidle_device *dev)
>   	ret = kobject_init_and_add(&kdrv->kobj, &ktype_driver_cpuidle,
>   				   &kdev->kobj, "driver");
>   	if (ret) {
> -		kobject_put(&kdrv->kobj);
> +		kfree(kdrv);
>   		return ret;
>   	}
>   
> @@ -712,7 +712,7 @@ int cpuidle_add_sysfs(struct cpuidle_device *dev)
>   	error = kobject_init_and_add(&kdev->kobj, &ktype_cpuidle, &cpu_dev->kobj,
>   				   "cpuidle");
>   	if (error) {
> -		kobject_put(&kdev->kobj);
> +		kfree(kdev);
>   		return error;
>   	}
>