[PATCH 5.14 681/849] drm/plane-helper: fix uninitialized variable reference

From: Greg Kroah-Hartman
Date: Mon Nov 15 2021 - 18:16:13 EST


From: Alex Xu (Hello71) <alex_y_xu@xxxxxxxx>

[ Upstream commit 7be28bd73f23e53d6e7f5fe891ba9503fc0c7210 ]

drivers/gpu/drm/drm_plane_helper.c: In function 'drm_primary_helper_update':
drivers/gpu/drm/drm_plane_helper.c:113:32: error: 'visible' is used uninitialized [-Werror=uninitialized]
113 | struct drm_plane_state plane_state = {
| ^~~~~~~~~~~
drivers/gpu/drm/drm_plane_helper.c:178:14: note: 'visible' was declared here
178 | bool visible;
| ^~~~~~~
cc1: all warnings being treated as errors

visible is an output, not an input. in practice this use might turn out
OK but it's still UB.

Fixes: df86af9133b4 ("drm/plane-helper: Add drm_plane_helper_check_state()")
Reviewed-by: Simon Ser <contact@xxxxxxxxxxx>
Signed-off-by: Alex Xu (Hello71) <alex_y_xu@xxxxxxxx>
Signed-off-by: Simon Ser <contact@xxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20211007063706.305984-1-alex_y_xu@xxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpu/drm/drm_plane_helper.c | 1 -
1 file changed, 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
index 3aae7ea522f23..c3f2292dc93d5 100644
--- a/drivers/gpu/drm/drm_plane_helper.c
+++ b/drivers/gpu/drm/drm_plane_helper.c
@@ -123,7 +123,6 @@ static int drm_plane_helper_check_update(struct drm_plane *plane,
.crtc_w = drm_rect_width(dst),
.crtc_h = drm_rect_height(dst),
.rotation = rotation,
- .visible = *visible,
};
struct drm_crtc_state crtc_state = {
.crtc = crtc,
--
2.33.0