target/linux/bcm27xx/patches-5.4/950-0489-drm-modes-parse_cmdline-Explicitly-memset-the-passed.patch

   1 From d89b3f22cf7b6bba8081f6d16c9087019fdcf586 Mon Sep 17 00:00:00 2001
   2 From: Hans de Goede <hdegoede@redhat.com>
   3 Date: Mon, 18 Nov 2019 16:51:32 +0100
   4 Subject: [PATCH] drm/modes: parse_cmdline: Explicitly memset the
   5  passed in drm_cmdline_mode struct
   6
   7 Commit d1fe276b5115f0d581c3cfe6154633b3547e8aab upstream.
   8
   9 Instead of only setting mode->specified on false on an early exit and
  10 leaving e.g. mode->bpp_specified and mode->refresh_specified as is,
  11 lets be consistent and just zero out the entire passed in struct at
  12 the top of drm_mode_parse_command_line_for_connector()
  13
  14 Changes in v3:
  15 -Drop "mode->specified = false;" line instead of the "return false;" (oops)
  16  This crasher was reported-by: kernel test robot <lkp@intel.com>
  17
  18 Acked-by: Maxime Ripard <mripard@kernel.org>
  19 Signed-off-by: Hans de Goede <hdegoede@redhat.com>
  20 Link: https://patchwork.freedesktop.org/patch/msgid/20191118155134.30468-11-hdegoede@redhat.com
  21 ---
  22  drivers/gpu/drm/drm_modes.c | 5 ++---
  23  1 file changed, 2 insertions(+), 3 deletions(-)
  24
  25 --- a/drivers/gpu/drm/drm_modes.c
  26 +++ b/drivers/gpu/drm/drm_modes.c
  27 @@ -1752,12 +1752,11 @@ bool drm_mode_parse_command_line_for_con
  28         char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
  29         int i, len, ret;
  30
  31 +       memset(mode, 0, sizeof(*mode));
  32         mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
  33
  34 -       if (!mode_option) {
  35 -               mode->specified = false;
  36 +       if (!mode_option)
  37                 return false;
  38 -       }
  39
  40         name = mode_option;
  41