linux-kernel - Re: [PATCH v4 2/2] x86/mce/amd: Fix memory leak when `threshold_create

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Date:   Mon, 7 Mar 2022 07:27:44 +0700
From:   Ammar Faizi <ammarfaizi2@...weeb.org>
To:     Yazen Ghannam <yazen.ghannam@....com>
Cc:     Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tony Luck <tony.luck@...el.com>, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org, gwml@...r.gnuweeb.org,
        x86@...nel.org, stable@...r.kernel.org,
        Alviro Iskandar Setiawan <alviro.iskandar@...il.com>,
        Jiri Hladky <hladky.jiri@...glemail.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alviro Iskandar Setiawan <alviro.iskandar@...weeb.org>
Subject: Re: [PATCH v4 2/2] x86/mce/amd: Fix memory leak when
 `threshold_create_bank()` fails

On 3/3/22 9:32 AM, Ammar Faizi wrote:
> It looks like this now. Yazen, Alviro, please review the
> following patch. If you think it looks good, I will submit
> it for the v5.
> 
>  From 91a447f837d502b7a040cd68f333fb98f4b941d9 Mon Sep 17 00:00:00 2001
> From: Ammar Faizi <ammarfaizi2@...weeb.org>
> Date: Thu, 3 Mar 2022 09:22:17 +0700
> Subject: [PATCH v5 2/2] x86/MCE/AMD: Fix memory leak when `threshold_create_bank()` fails
> 
> In mce_threshold_create_device(), if threshold_create_bank() fails, the
> @bp will be leaked, because mce_threshold_remove_device() will not free
> the @bp. It only frees the @bp when we've already written the @bp to
> the @threshold_banks per-CPU variable, but at the point, we haven't.
> 
> Fix this by extracting the cleanup part into a new static function
> _mce_threshold_remove_device(), then use it from create/remove device
> function. Also, eliminate the "goto out_err". Just early return inside
> the loop if we fail.
> 
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: stable@...r.kernel.org # v5.8+
> Fixes: 6458de97fc15 ("x86/mce/amd: Straighten CPU hotplug path")
> Co-authored-by: Alviro Iskandar Setiawan <alviro.iskandar@...weeb.org>
> Signed-off-by: Alviro Iskandar Setiawan <alviro.iskandar@...weeb.org>
> Co-authored-by: Yazen Ghannam <yazen.ghannam@....com>
> Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
> Signed-off-by: Ammar Faizi <ammarfaizi2@...weeb.org>


Hi,

It's Monday morning...

Friendly ping for Yazen from AMD. What do you think of this patch? If
it looks good, I will submit it for the v5 revision. See the ref below
if you lost track of the full message.

Ref: https://lore.kernel.org/lkml/9dfe087a-f941-1bc4-657d-7e7c198888ff@gnuweeb.org/

Thanks!

-- 
Ammar Faizi