openwrt/target/linux/bcm27xx/patches-5.4/950-0600-drm-Checking-of-the-pitch-is-only-valid-for-linear-f.patch

From 60ef8af4bc2d5f8643adbcb69bb1f52e491a96ae Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Mon, 27 Jan 2020 10:22:44 +0000
Subject: [PATCH] drm: Checking of the pitch is only valid for linear
 formats

framebuffer_check was computing a minimum pitch value and ensuring
that the provided value was greater than this.
That check is only valid if the format is linear.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/gpu/drm/drm_framebuffer.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

--- a/drivers/gpu/drm/drm_framebuffer.c
+++ b/drivers/gpu/drm/drm_framebuffer.c
@@ -217,12 +217,16 @@ static int framebuffer_check(struct drm_
 		if (min_pitch > UINT_MAX)
 			return -ERANGE;
 
-		if ((uint64_t) height * r->pitches[i] + r->offsets[i] > UINT_MAX)
-			return -ERANGE;
+		if (r->modifier[i] == DRM_FORMAT_MOD_LINEAR) {
+			if ((uint64_t)height * r->pitches[i] + r->offsets[i] >
+								UINT_MAX)
+				return -ERANGE;
 
-		if (block_size && r->pitches[i] < min_pitch) {
-			DRM_DEBUG_KMS("bad pitch %u for plane %d\n", r->pitches[i], i);
-			return -EINVAL;
+			if (block_size && r->pitches[i] < min_pitch) {
+				DRM_DEBUG_KMS("bad pitch %u for plane %d\n",
+					      r->pitches[i], i);
+				return -EINVAL;
+			}
 		}
 
 		if (r->modifier[i] && !(r->flags & DRM_MODE_FB_MODIFIERS)) {