linux-kernel - Re: [PATCH 1/1] EDAC/ghes: Fix for NULL pointer dereference in ghes_edac

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Date:   Tue, 15 Sep 2020 14:25:47 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Shiju Jose <shiju.jose@...wei.com>
Cc:     "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "james.morse@....com" <james.morse@....com>,
        Linuxarm <linuxarm@...wei.com>, Robert Richter <rric@...nel.org>
Subject: Re: [PATCH 1/1] EDAC/ghes: Fix for NULL pointer dereference in
 ghes_edac_register()

On Tue, Sep 15, 2020 at 10:54:33AM +0000, Shiju Jose wrote:
> I debug with adding more logs. I found that in our platform
> hw->num_dimms was 32 when called ghes_edac_register() second time when
> probe a new ghes instance, the check !(hw->num_dimms % 16) in the
> enumerate_dimms() passed and it allocated memory for hw->dimms. Thus
> it did not fail with NULL pointer dereference in ghes_edac_register().

Oh, what a lucky coincidence ;-\

> With the your new fix hw->num_dimms reset to 0.

Thanks for testing and digging out what is happening on your machine. So
I've queued them here:

https://git.kernel.org/pub/scm/linux/kernel/git/ras/ras.git/log/?h=edac-for-next

Will send them to Linus on the weekend so that they make it into 5.9.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette