linux-kernel - Re: CVE-2024-46808: drm/amd/display: Add missing NULL pointer check within dpcd_extend_address

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Message-ID: <miszqpmc73g7otccgv2hifv6uuckmq6vuxz6sxczfzkyvd5vhz@qu5ts3iwvzmw>
Date: Wed, 2 Oct 2024 16:14:17 +0200
From: Michal Koutný <mkoutny@...e.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: cve@...nel.org, linux-kernel@...r.kernel.org, 
	Tom Chung <chiahsuan.chung@....com>, Hersen Wu <hersenxs.wu@....com>, 
	Alex Deucher <alexander.deucher@....com>
Subject: Re: CVE-2024-46808: drm/amd/display: Add missing NULL pointer check
 within dpcd_extend_address_range

On Mon, Sep 30, 2024 at 09:09:18PM GMT, Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> It's a good fix for those without that option enabled :)

Users with panic_on_warn=0 will see a warning but there'll be a NULL
pointer floating around. (That's not good for kernel code.) There is no
code flow change here. It's not a vulnerability fix. 

There are other fixes that I've seen recently that at least change the
code flow:

- CVE-2024-46805: drm/amdgpu: fix the waring dereferencing hive
- CVE-2024-46811: kernel: drm/amd/display: Fix index may exceed array range within fpu_update_bw_bounding_box 
- CVE-2024-46812: kernel: drm/amd/display: Skip inactive planes within ModeSupportAndSystemConfiguration

(These are not vulnerability fixes for panic_on_warn=1 though.)

So these CVE numbers point out potential vulnerabilities but the
associated patches don't fix them (generally).

> Agreed, it could be fixed better.

Let me Cc also Alex (last S-O-B on them) to be aware of that.

I think I can't do more at the moment.

Regards,
Michal

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