linux-kernel - Re: [PATCH] fix memory leak in ramoops

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Date:   Fri, 28 Sep 2018 14:54:51 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     nixiaoming <nixiaoming@...wei.com>, Jan Kara <jack@...e.cz>,
        Amir Goldstein <amir73il@...il.com>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Joel Fernandes <joelaf@...gle.com>,
        Geliang Tang <geliangtang@...il.com>
Subject: Re: [PATCH] fix memory leak in ramoops_init

On Fri, Sep 28, 2018 at 2:26 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Mon, 17 Sep 2018 17:15:31 +0800 nixiaoming <nixiaoming@...wei.com> wrote:
>
>> 1, memory leak in ramoops_register_dummy.
>>    dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL);
>>    but no free when platform_device_register_data return fail
>>
>> 2, if kzalloc(sizeof(*dummy_data), GFP_KERNEL) return NULL,
>>     but platform_driver_register(&ramoops_driver) return 0
>>    kfree(NULL) in ramoops_exit
>> so, add return val for ramoops_register_dummy, and check it in ramoops_init
>>
>> 3, memory leak in ramoops_init.
>>    miss platform_device_unregister(dummy) and kfree(dummy_data)
>>    when platform_driver_register(&ramoops_driver) return fail
>
> Looks right.
>
> It's unclear (to me) who maintains fs/pstore/ram.c.  Let's add some
> Cc's and see if we can catch a reviewed-by.

It's me:

PSTORE FILESYSTEM
M:      Kees Cook <keescook@...omium.org>
M:      Anton Vorontsov <anton@...msg.org>
M:      Colin Cross <ccross@...roid.com>
M:      Tony Luck <tony.luck@...el.com>
S:      Maintained
T:      git git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git
for-next/pstore
F:      fs/pstore/
F:      include/linux/pstore*
F:      drivers/firmware/efi/efi-pstore.c
F:      drivers/acpi/apei/erst.c
F:      Documentation/admin-guide/ramoops.rst
F:      Documentation/devicetree/bindings/reserved-memory/ramoops.txt
K:      \b(pstore|ramoops)

I'll take review it and take it via the pstore tree. Thanks!

-Kees

-- 
Kees Cook
Pixel Security