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From 38ff187b7bb7524a6c8040c76889637068723f35 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Wed, 10 Nov 2021 16:36:12 +0000
Subject: [PATCH] drm/vc4: Validate the size of the gamma_lut
Add a check to vc4_hvs_gamma_check to ensure a new non-empty
gamma LUT is of the correct length before accepting it.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
drivers/gpu/drm/vc4/vc4_hvs.c | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/drivers/gpu/drm/vc4/vc4_hvs.c
+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
@@ -561,6 +561,16 @@ static int vc4_hvs_gamma_check(struct dr
if (!crtc_state->color_mgmt_changed)
return 0;
+ if (crtc_state->gamma_lut) {
+ unsigned int len = drm_color_lut_size(crtc_state->gamma_lut);
+
+ if (len != crtc->gamma_size) {
+ DRM_DEBUG_KMS("Invalid LUT size; got %u, expected %u\n",
+ len, crtc->gamma_size);
+ return -EINVAL;
+ }
+ }
+
connector = vc4_get_crtc_connector(crtc, crtc_state);
if (!connector)
return -EINVAL;
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