openwrt/target/linux/bcm27xx/patches-5.4/950-0478-drm-modes-parse_cmdline-Explicitly-memset-the-passed.patch

From d89b3f22cf7b6bba8081f6d16c9087019fdcf586 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 18 Nov 2019 16:51:32 +0100
Subject: [PATCH] drm/modes: parse_cmdline: Explicitly memset the
 passed in drm_cmdline_mode struct

Commit d1fe276b5115f0d581c3cfe6154633b3547e8aab upstream.

Instead of only setting mode->specified on false on an early exit and
leaving e.g. mode->bpp_specified and mode->refresh_specified as is,
lets be consistent and just zero out the entire passed in struct at
the top of drm_mode_parse_command_line_for_connector()

Changes in v3:
-Drop "mode->specified = false;" line instead of the "return false;" (oops)
 This crasher was reported-by: kernel test robot <lkp@intel.com>

Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191118155134.30468-11-hdegoede@redhat.com
---
 drivers/gpu/drm/drm_modes.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1752,12 +1752,11 @@ bool drm_mode_parse_command_line_for_con
 	char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
 	int i, len, ret;
 
+	memset(mode, 0, sizeof(*mode));
 	mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
 
-	if (!mode_option) {
-		mode->specified = false;
+	if (!mode_option)
 		return false;
-	}
 
 	name = mode_option;