linux-kernel - Re: [PATCH v2] EDAC: Fix some refcount leaks

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Date:   Thu, 12 May 2022 17:46:32 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        James Morse <james.morse@....com>,
        Robert Richter <rric@...nel.org>,
        Greg Kroah-Hartman <gregkh@...e.de>,
        Doug Thompson <dougthompson@...ssion.com>,
        linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] EDAC: Fix some refcount leaks

On Thu, May 12, 2022 at 11:59:06AM +0400, Miaoqian Lin wrote:
> kobject_init_and_add() takes reference even when it fails.
> According to the doc of kobject_init_and_add()
> 
>    If this function returns an error, kobject_put() must be called to
>    properly clean up the memory associated with the object.
> 
> Fix this by calling kobject_put() when kobject_init_and_add() fails.

$ git grep -w kobject_init_and_add drivers/edac/
drivers/edac/edac_device_sysfs.c:259:   err = kobject_init_and_add(&edac_dev->kobj, &ktype_device_ctrl,
drivers/edac/edac_device_sysfs.c:538:   err = kobject_init_and_add(&block->kobj, &ktype_block_ctrl,
drivers/edac/edac_device_sysfs.c:637:   err = kobject_init_and_add(&instance->kobj, &ktype_instance_ctrl,
drivers/edac/edac_pci_sysfs.c:175:      err = kobject_init_and_add(&pci->kobj, &ktype_pci_instance,
drivers/edac/edac_pci_sysfs.c:372:      err = kobject_init_and_add(edac_pci_top_main_kobj,

Wanna audit them all, make sure they all put the kobject properly and do
a single patch fixing those which need fixing?

Thx.

-- 
Regards/Gruss,
    Boris.

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