Re: [PATCH 0/3] hw/display/exynos4210_find: Clamp windows to screen

On Mon, Jul 6, 2026 at 9:33 PM Peter Maydell <[email protected]> wrote:
>
> The exynos4210_fimd device has a setup where the guest can program
> both the overall size of the LCD screen and also the corners of
> "windows" that define where the guest memory should appear on that
> screen. The current code assumes that the guest is sensible and
> puts the corners of windows inside the overall screen. If it doesn't
> then we will try to copy data to an address that is outside the
> interfal framebuffer memory that we allocate to be the size of the
> screen.
>
> This patchset clamps the window coordinates to be within the screen
> size. Patches 1 and 2 are simple refactorings to make the third
> patch easier to read.
>
> This fixes https://gitlab.com/qemu-project/qemu/-/work_items/3795

Reviewed-by: Marc-André Lureau <[email protected]>

>
> thanks
> -- PMM
>
> Peter Maydell (3):
>   hw/display/exynos4210_fimd: Factor out finding screen width/height
>   hw/display/exynos4210_fimd: Pass width to draw_line functions
>   hw/display/exynos4210_fimd: Clamp windows to screen size
>
>  hw/display/exynos4210_fimd.c | 54 ++++++++++++++++++++++++++----------
>  1 file changed, 39 insertions(+), 15 deletions(-)
>
> --
> 2.43.0
>
>


-- 
Marc-André Lureau