Re: [PATCH] drm/nouveau/dispnv04: fix null pointer dereference in nv17_tv_get_ld_modes
From: Markus Elfring
Date: Tue Jun 25 2024 - 09:44:14 EST
> 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@xxxxxxxxxxxxxxx
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