linux-kernel - Re: [PATCH][next] drm/atomic: avoid null pointer dereference on pointer crtc

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Message-ID: <Gsgkd1PRlRQd3tlZ0nZROZwVfLvE7QmJdeOA8wkeVyE9ewGIj89RZAixoLltsvvgqB-Ica_sfpcNbwdtRCjDx16tYykgs61QOJRYm9Eumys=@emersion.fr>
Date:   Mon, 16 Nov 2020 11:08:13 +0000
From:   Simon Ser <contact@...rsion.fr>
To:     Colin King <colin.king@...onical.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sam Ravnborg <sam@...nborg.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] drm/atomic: avoid null pointer dereference on pointer crtc

On Monday, November 16, 2020 12:03 PM, Colin King <colin.king@...onical.com> wrote:

> From: Colin Ian King colin.king@...onical.com
>
> Since moving to the new debug helper functions we now have a debug message
> that dereferences crtc to print a kernel debug message when crtc is null
> and so this debug message will now cause a null pointer dereference. Since
> this is a debug message it probably is just simplest to fix this by just
> removing the debug message altogether.

NACK. This removes the log altogether instead of fixing it.

A fix has already been pushed to drm-misc-next: 0003b687ee6d ("drm: fix
oops in drm_atomic_set_crtc_for_connector").