Re: [PATCH 05/21] fbcon: Introduce wrapper for console->fb_info lookup

[Sam Ravnborg]

On Mon, Jan 31, 2022 at 10:05:36PM +0100, Daniel Vetter wrote:
> Half of it is protected by console_lock, but the other half is a lot
> more awkward: Registration/deregistration of fbdev are serialized, but
> we don't really clear out anything in con2fb_map and so there's
> potential for use-after free mixups.
> 
> First step is to encapsulate the lookup.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> Cc: Helge Deller <deller@xxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
> Cc: Du Cheng <ducheng2@xxxxxxxxx>
> Cc: Claudio Suarez <cssk@xxxxxxxx>
> Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Acked-by: Sam Ravnborg <sam@xxxxxxxxxxxx>