target/linux/bcm27xx/patches-5.15/950-0567-drm-Fix-double-free-from-checking-if-gamma-lut-has-b.patch

   1 From 3e52ea57180471250ba4bb426527ab9bbad4e5a4 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Mon, 8 Nov 2021 13:55:15 +0000
   4 Subject: [PATCH] drm: Fix double free from checking if gamma lut has
   5  been updated
   6
   7 The code falls through to "fail" under all conditions, so there is no
   8 need for the drm_property_blob_put if the gamma lut hasn't been changed.
   9 Fixes: 9cca26674a2b "drm: Check whether the gamma lut has changed before updating"
  10
  11 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  12 ---
  13  drivers/gpu/drm/drm_color_mgmt.c | 2 --
  14  1 file changed, 2 deletions(-)
  15
  16 --- a/drivers/gpu/drm/drm_color_mgmt.c
  17 +++ b/drivers/gpu/drm/drm_color_mgmt.c
  18 @@ -330,8 +330,6 @@ static int drm_crtc_legacy_gamma_set(str
  19             memcmp(crtc_state->gamma_lut->data, blob_data, blob->length))
  20                 replaced |= drm_property_replace_blob(&crtc_state->gamma_lut,
  21                                               use_gamma_lut ? blob : NULL);
  22 -       else
  23 -               drm_property_blob_put(blob);
  24         crtc_state->color_mgmt_changed |= replaced;
  25
  26         ret = drm_atomic_commit(state);