target/linux/bcm27xx/patches-5.15/950-0571-drm-vc4-Validate-the-size-of-the-gamma_lut.patch

   1 From 38ff187b7bb7524a6c8040c76889637068723f35 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Wed, 10 Nov 2021 16:36:12 +0000
   4 Subject: [PATCH] drm/vc4: Validate the size of the gamma_lut
   5
   6 Add a check to vc4_hvs_gamma_check to ensure a new non-empty
   7 gamma LUT is of the correct length before accepting it.
   8
   9 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  10 ---
  11  drivers/gpu/drm/vc4/vc4_hvs.c | 10 ++++++++++
  12  1 file changed, 10 insertions(+)
  13
  14 --- a/drivers/gpu/drm/vc4/vc4_hvs.c
  15 +++ b/drivers/gpu/drm/vc4/vc4_hvs.c
  16 @@ -538,6 +538,16 @@ static int vc4_hvs_gamma_check(struct dr
  17         if (!crtc_state->color_mgmt_changed)
  18                 return 0;
  19
  20 +       if (crtc_state->gamma_lut) {
  21 +               unsigned int len = drm_color_lut_size(crtc_state->gamma_lut);
  22 +
  23 +               if (len != crtc->gamma_size) {
  24 +                       DRM_DEBUG_KMS("Invalid LUT size; got %u, expected %u\n",
  25 +                                     len, crtc->gamma_size);
  26 +                       return -EINVAL;
  27 +               }
  28 +       }
  29 +
  30         connector = vc4_get_crtc_connector(crtc, crtc_state);
  31         if (!connector)
  32                 return -EINVAL;