[Intel-gfx] [PATCH i-g-t 3/5] lib/igt_kms: Fix possible out-of-bounds access

[Brian Starkey]

If there's no primary plane, pipe->plane_primary == -1, and the assert
meant to check that it's valid will access pipe->planes[-1].

Fix that to check that pipe->plane_primary has been set instead.

Fixes: 36656239ef96 lib/igt_kms: Implement dynamic plane count support
Signed-off-by: Brian Starkey <brian.starkey at arm.com>
---
 lib/igt_kms.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index 783c891aebf1..45c90c71f301 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -1820,9 +1820,9 @@ void igt_display_init(igt_display_t *display, int drm_fd)
 
 		/*
 		 * At the bare minimum, we should expect to have a primary
-		 * plane
+		 * plane, and it must be in slot 0.
 		 */
-		igt_assert(pipe->planes[pipe->plane_primary].drm_plane);
+		igt_assert_eq(pipe->plane_primary, 0);
 
 		if (display->has_cursor_plane) {
 			/*
-- 
1.7.9.5