fix

Author: QuantumExplorer

key-wallet-ffi/include/key_wallet_ffi.h

@@ -3743,6 +3743,12 @@ char *wallet_manager_describe(const FFIWalletManager *manager,
 
 /*
  Free a string previously returned by wallet manager APIs.
+
+ # Safety
+ - `value` must be either null or a pointer obtained from
+   `wallet_manager_describe` (or other wallet manager FFI helpers that
+   specify this free function).
+ - The pointer must not be used after this call returns.
  */
  void wallet_manager_free_string(char *value) ;
 

key-wallet-ffi/src/wallet_manager.rs

@@ -88,6 +88,12 @@ pub unsafe extern "C" fn wallet_manager_describe(
 }
 
 /// Free a string previously returned by wallet manager APIs.
+///
+/// # Safety
+/// - `value` must be either null or a pointer obtained from
+///   `wallet_manager_describe` (or other wallet manager FFI helpers that
+///   specify this free function).
+/// - The pointer must not be used after this call returns.
 #[no_mangle]
 pub unsafe extern "C" fn wallet_manager_free_string(value: *mut c_char) {
     if value.is_null() {