linux-kernel - Re: [PATCH 092/190] Revert "power: charger-manager: fix a potential NULL pointer dereference"

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Message-ID: <20210421160248.fveahtwspxa53fft@earth.universe>
Date:   Wed, 21 Apr 2021 18:02:48 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Kangjie Lu <kjlu@....edu>
Subject: Re: [PATCH 092/190] Revert "power: charger-manager: fix a potential
 NULL pointer dereference"

Hi,

On Wed, Apr 21, 2021 at 02:59:27PM +0200, Greg Kroah-Hartman wrote:
> This reverts commit 75cf4f5aa903604e1bd7bec2c0988d643c6fb946.
> 
> 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: Kangjie Lu <kjlu@....edu>
> Cc: Sebastian Reichel <sebastian.reichel@...labora.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---

Doing another review:

create_freezable_workqueue can return NULL when allocations fails
and it is the first call in late init call, so it's fine to just
exit with -ENOMEM.

I suggest to drop the revert.

-- Sebastian

>  drivers/power/supply/charger-manager.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/power/supply/charger-manager.c b/drivers/power/supply/charger-manager.c
> index 4dea8ecd70bc..f34c07ffcfe6 100644
> --- a/drivers/power/supply/charger-manager.c
> +++ b/drivers/power/supply/charger-manager.c
> @@ -1749,9 +1749,6 @@ static struct platform_driver charger_manager_driver = {
>  static int __init charger_manager_init(void)
>  {
>  	cm_wq = create_freezable_workqueue("charger_manager");
> -	if (unlikely(!cm_wq))
> -		return -ENOMEM;
> -
>  	INIT_DELAYED_WORK(&cm_monitor_work, cm_monitor_poller);
>  
>  	return platform_driver_register(&charger_manager_driver);
> -- 
> 2.31.1
> 

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