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Commit e0c34051 authored by Thierry Reding's avatar Thierry Reding Committed by Greg Kroah-Hartman
Browse files

drm/tegra: hub: Fix dereference before check 



[ Upstream commit 7cf77b273a8fc51e7de622fa6691abd4436a9a6b ]

Reported-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
Signed-off-by: default avatarSasha Levin (Microsoft) <sashal@kernel.org>
parent abd76731

drivers/gpu/drm/tegra/hub.c

+3 −1
Original line number Diff line number Diff line
@@ -378,14 +378,16 @@ static int tegra_shared_plane_atomic_check(struct drm_plane *plane, 
static void tegra_shared_plane_atomic_disable(struct drm_plane *plane,

					      struct drm_plane_state *old_state)

{

	struct tegra_dc *dc = to_tegra_dc(old_state->crtc);

	struct tegra_plane *p = to_tegra_plane(plane);

	struct tegra_dc *dc;

	u32 value;



	/* rien ne va plus */

	if (!old_state || !old_state->crtc)

		return;



	dc = to_tegra_dc(old_state->crtc);



	/*

	 * XXX Legacy helpers seem to sometimes call ->atomic_disable() even

	 * on planes that are already disabled. Make sure we fallback to the