From baa266ff5568862d25f6cd8b7807e8e226029b8d Mon Sep 17 00:00:00 2001
From: Riccardo Zaglia <riccardo.zaglia5@gmail.com>
Date: Sun, 15 Sep 2024 23:00:40 +0200
Subject: [PATCH] Fix UB in `Instance::supports_<prop>()`

---
 openxr/src/instance.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/openxr/src/instance.rs b/openxr/src/instance.rs
index e5f3417..06a7f24 100644
--- a/openxr/src/instance.rs
+++ b/openxr/src/instance.rs
@@ -151,6 +151,9 @@ impl Instance {
 
     #[inline]
     pub fn supports_render_model_loading(&self, system: SystemId) -> Result<bool> {
+        if self.exts().fb_render_model.is_none() {
+            return Err(sys::Result::ERROR_EXTENSION_NOT_PRESENT);
+        }
         unsafe {
             let mut render_model = sys::SystemRenderModelPropertiesFB::out(ptr::null_mut());
             let mut p = sys::SystemProperties::out(&mut render_model as *mut _ as _);
@@ -168,6 +171,9 @@ impl Instance {
 
     #[inline]
     pub fn supports_hand_tracking(&self, system: SystemId) -> Result<bool> {
+        if self.exts().ext_hand_interaction.is_none() {
+            return Err(sys::Result::ERROR_EXTENSION_NOT_PRESENT);
+        }
         unsafe {
             let mut hand = sys::SystemHandTrackingPropertiesEXT::out(ptr::null_mut());
             let mut p = sys::SystemProperties::out(&mut hand as *mut _ as _);