linux-kernel - Re: [PATCH 051/190] Revert "power: supply: core: fix memory leak in HWMON error path"

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Message-ID: <20210421155101.n2mbmhj6x42i3a4l@earth.universe>
Date:   Wed, 21 Apr 2021 17:51:01 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...nel.org,
        Qiushi Wu <wu000273@....edu>
Subject: Re: [PATCH 051/190] Revert "power: supply: core: fix memory leak in
 HWMON error path"

Hi,

On Wed, Apr 21, 2021 at 02:58:46PM +0200, Greg Kroah-Hartman wrote:
> This reverts commit 1d7a7128a2e9e1f137c99b0a44e94d70a77343e3.
> 
> 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: stable@...nel.org
> Cc: Qiushi Wu <wu000273@....edu>
> Cc: Sebastian Reichel <sebastian.reichel@...labora.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---

Change is quite simple, so doing another review now:

It is correct that power_supply_hwmon_bitmap_free() must be called
when devm_add_action() fails. This is not already done in the error
path, so the original patch is correct and the revert reintroduces a
memory leak in error path.

I suggest dropping the revert.

Thanks,

-- Sebastian

>  drivers/power/supply/power_supply_hwmon.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/power/supply/power_supply_hwmon.c b/drivers/power/supply/power_supply_hwmon.c
> index bffe6d84c429..62ca29e0d47a 100644
> --- a/drivers/power/supply/power_supply_hwmon.c
> +++ b/drivers/power/supply/power_supply_hwmon.c
> @@ -356,7 +356,7 @@ int power_supply_add_hwmon_sysfs(struct power_supply *psy)
>  		goto error;
>  	}
>  
> -	ret = devm_add_action_or_reset(dev, power_supply_hwmon_bitmap_free,
> +	ret = devm_add_action(dev, power_supply_hwmon_bitmap_free,
>  			      psyhw->props);
>  	if (ret)
>  		goto error;
> -- 
> 2.31.1
> 

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