drm/i915/display: Handle invalid fb_modifier in intel_fb_modifier_to_tiling

Lookup_modifier is returning INTEL_PLANE_CAP_TILING_4 on invalid
fb_modifier value. Use lookup_modifier_or_null in
intel_fb_modifier_to_tiling and return I915_TILING_NONE in case
lookup_modifier_or_null returns null.
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231203114840.841311-4-jouni.hogander@intel.com

drivers/gpu/drm/i915/display/intel_fb.c

@@ -303,7 +303,14 @@ lookup_format_info(const struct drm_format_info formats[],
 
 unsigned int intel_fb_modifier_to_tiling(u64 fb_modifier)
 {
-	u8 tiling_caps = lookup_modifier(fb_modifier)->plane_caps &
+	const struct intel_modifier_desc *md;
+	u8 tiling_caps;
+
+	md = lookup_modifier_or_null(fb_modifier);
+	if (!md)
+		return I915_TILING_NONE;
+
+	tiling_caps = lookup_modifier_or_null(fb_modifier)->plane_caps &
 			 INTEL_PLANE_CAP_TILING_MASK;
 
 	switch (tiling_caps) {