linux-kernel - [PATCH 1/6] drm/panic: Fix drawing the logo on a small narrow screen

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Message-ID: <20251009122955.562888-2-jfalempe@redhat.com>
Date: Thu,  9 Oct 2025 14:24:48 +0200
From: Jocelyn Falempe <jfalempe@...hat.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Jocelyn Falempe <jfalempe@...hat.com>,
	Javier Martinez Canillas <javierm@...hat.com>,
	linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Cc: stable@...r.kernel.org
Subject: [PATCH 1/6] drm/panic: Fix drawing the logo on a small narrow screen

If the logo width is bigger than the framebuffer width, and the
height is big enough to hold the logo and the message, it will draw
at x coordinate that are higher than the width, and ends up in a
corrupted image.

Fixes: 4b570ac2eb54 ("drm/rect: Add drm_rect_overlap()")
Signed-off-by: Jocelyn Falempe <jfalempe@...hat.com>
---
 drivers/gpu/drm/drm_panic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_panic.c b/drivers/gpu/drm/drm_panic.c
index 1d6312fa1429..23ba791c6131 100644
--- a/drivers/gpu/drm/drm_panic.c
+++ b/drivers/gpu/drm/drm_panic.c
@@ -429,6 +429,9 @@ static void drm_panic_logo_rect(struct drm_rect *rect, const struct font_desc *f
 static void drm_panic_logo_draw(struct drm_scanout_buffer *sb, struct drm_rect *rect,
 				const struct font_desc *font, u32 fg_color)
 {
+	if (rect->x2 > sb->width || rect->y2 > sb->height)
+		return;
+
 	if (logo_mono)
 		drm_panic_blit(sb, rect, logo_mono->data,
 			       DIV_ROUND_UP(drm_rect_width(rect), 8), 1, fg_color);
-- 
2.51.0