1 files changed, 4 insertions, 6 deletions
diff --git a/src/rust/protover/ffi.rs b/src/rust/protover/ffi.rs
index e3e545db75..f55b87acf6 100644
--- a/src/rust/protover/ffi.rs
+++ b/src/rust/protover/ffi.rs
@@ -65,12 +65,10 @@ pub extern "C" fn protover_all_supported(
 
     if maybe_unsupported.is_some() {
         let unsupported: UnvalidatedProtoEntry = maybe_unsupported.unwrap();
-        let c_unsupported: CString = match CString::new(unsupported.to_string()) {
-            Ok(n) => n,
-            Err(_) => return 1,
-        };
-
-        let ptr = c_unsupported.into_raw();
+        if missing_out.is_null() {
+            return 0;
+        }
+        let ptr = allocate_and_copy_string(&unsupported.to_string());
         unsafe { *missing_out = ptr };
 
         return 0;