linux-kernel - Re: [PATCH] x86: mce: Potential memory leaks when initializing mcheck devices

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Message-ID: <AANLkTikMY+7ApHCXY_jjue9RRCE-ORKrj4pAyy5H0W8_@mail.gmail.com>
Date:	Mon, 7 Mar 2011 07:56:42 +0100
From:	Johan Wessfeldt <johan.wessfeldt@...il.com>
To:	tglx@...utronix.de
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Johan Wessfeldt <johan.wessfeldt@...il.com>
Subject: Re: [PATCH] x86: mce: Potential memory leaks when initializing mcheck devices

Oops
missed another call to free_cpumask_var().  Will send a v2 patch

Regards
// Johan W

On Fri, Mar 4, 2011 at 7:31 PM, Johan Wessfeldt
<johan.wessfeldt@...il.com> wrote:
> This patch makes sure cleanup is done properly when mcheck fails
> initializing any of its resources.
>
> Note!
> It should be safe to call mce_remove_device on ANY of the cpus as
> mce_remove_device checks if corresponding cpu was initialized
> before removing its resources.
>
> Please review.
>
> Signed-off-by: Johan Wessfeldt <johan.wessfeldt@...il.com>
> ---
>  arch/x86/kernel/cpu/mcheck/mce.c |   17 ++++++++++++++---
>  1 files changed, 14 insertions(+), 3 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
> index d916183..273f2f6 100644
> --- a/arch/x86/kernel/cpu/mcheck/mce.c
> +++ b/arch/x86/kernel/cpu/mcheck/mce.c
> @@ -2136,15 +2136,26 @@ static __init int mcheck_init_device(void)
>        for_each_online_cpu(i) {
>                err = mce_create_device(i);
>                if (err)
> -                       return err;
> +                       goto out_unreg;
>        }
>
>        register_hotcpu_notifier(&mce_cpu_notifier);
> -       misc_register(&mce_log_device);
> +       err = misc_register(&mce_log_device);
> +       if (err)
> +               goto out_unreg_hotcpu;
> +
> +       return 0;
> +
> +out_unreg_hotcpu:
> +       unregister_hotcpu_notifier(&mce_cpu_notifier);
> +out_unreg:
> +       for_each_online_cpu(i)
> +               mce_remove_device(i);
>
> +       sysdev_class_unregister(&mce_sysclass);
> +       free_cpumask_var(mce_dev_initialized);
>        return err;
>  }
> -
>  device_initcall(mcheck_init_device);
>
>  /*
> --
> 1.7.2.3
>
>
--
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