Potential fix

libwasmvm/src/memory.rs

@@ -220,7 +220,14 @@ impl UnmanagedVector {
                     // Can be replaced with Vec::into_raw_parts when stable
                     // https://doc.rust-lang.org/std/vec/struct.Vec.html#method.into_raw_parts
                     let mut data = mem::ManuallyDrop::new(data);
-                    (data.as_mut_ptr(), data.len(), data.capacity())
+                    if data.capacity() == 0 {
+                        // we need to explicitly use a null pointer here, since `as_mut_ptr` can
+                        // return arbitrary addresses (e.g. 0x01) on an empty Vec,
+                        // which trips up Go's pointer checks
+                        (std::ptr::null_mut::<u8>(), 0, 0)
+                    } else {
+                        (data.as_mut_ptr(), data.len(), data.capacity())
+                    }
                 };
                 Self {
                     is_none: false,