Re: [PATCH] fbcon: Avoid OOB font access if console rotation fails

[Greg KH]

On Thu, Jun 18, 2026 at 02:30:17PM +0800, HAN Ruidong via B4 Relay wrote:
> From: HAN Ruidong <rdhan@xxxxxxxxxx>
> 
> [ Upstream commit e4ef723d8975a2694cc90733a6b888a5e2841842 ]
> 
> Clear the font buffer if the reallocation during console rotation fails
> in fbcon_rotate_font(). The putcs implementations for the rotated buffer
> will return early in this case. See [1] for an example.
> 
> Currently, fbcon_rotate_font() keeps the old buffer, which is too small
> for the rotated font. Printing to the rotated console with a high-enough
> character code will overflow the font buffer.
> 
> v2:
> - fix typos in commit message
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
> Fixes: 6cc50e1c5b57 ("[PATCH] fbcon: Console Rotation - Add support to rotate font bitmap")
> Cc: stable@xxxxxxxxxxxxxxx # v2.6.15+
> Link: https://elixir.bootlin.com/linux/v6.19/source/drivers/video/fbdev/core/fbcon_ccw.c#L144 # [1]
> Signed-off-by: Helge Deller <deller@xxxxxx>
> [ renamed `par` to `ops` to match the v5.15 local pointer name ]
> Signed-off-by: HAN Ruidong <rdhan@xxxxxxxxxx>
> ---
>  drivers/video/fbdev/core/fbcon_rotate.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)

What stable tree(s) is this for?

thanks,

greg k-h