linux-kernel - Re: [PATCH] drm/nouveau/dispnv04: fix null pointer dereference in nv17_tv_get_ld

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Message-ID: <2024062533-quiver-cacti-b068@gregkh>
Date: Tue, 25 Jun 2024 16:30:41 +0200
From: Greg KH <greg@...ah.com>
To: Markus Elfring <Markus.Elfring@....de>
Cc: Ma Ke <make24@...as.ac.cn>, nouveau@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>,
	Danilo Krummrich <dakr@...hat.com>,
	David Airlie <airlied@...il.com>, Karol Herbst <kherbst@...hat.com>,
	Lyude Paul <lyude@...hat.com>, stable@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/nouveau/dispnv04: fix null pointer dereference in
 nv17_tv_get_ld_modes

On Tue, Jun 25, 2024 at 03:43:37PM +0200, Markus Elfring wrote:
> > In nv17_tv_get_ld_modes(), the return value of drm_mode_duplicate() is
> > assigned to mode, which will lead to a possible NULL pointer dereference
> > on failure of drm_mode_duplicate(). Add a check to avoid npd.
> 
> Can a wording approach (like the following) be a better change description?
> 
>   A null pointer is stored in the local variable “mode” after a call
>   of the function “drm_mode_duplicate” failed. This pointer was used
>   in a subsequent statement where an undesirable dereference will
>   be performed then.
>   Thus add a corresponding return value check.
> 
> 
> > Cc: stable@...r.kernel.org
> 
> Would you like to add the tag “Fixes” accordingly?
> 
> 
> How do you think about to use a summary phrase like
> “Prevent null pointer dereference in nv17_tv_get_ld_modes()”?
> 
> 
> Regards,
> Markus
> 
Hi,

This is the semi-friendly patch-bot of Greg Kroah-Hartman.

Markus, you seem to have sent a nonsensical or otherwise pointless
review comment to a patch submission on a Linux kernel developer mailing
list.  I strongly suggest that you not do this anymore.  Please do not
bother developers who are actively working to produce patches and
features with comments that, in the end, are a waste of time.

Patch submitter, please ignore Markus's suggestion; you do not need to
follow it at all.  The person/bot/AI that sent it is being ignored by
almost all Linux kernel maintainers for having a persistent pattern of
behavior of producing distracting and pointless commentary, and
inability to adapt to feedback.  Please feel free to also ignore emails
from them.

thanks,

greg k-h's patch email bot