corrected handling of FFI pointer to pointer to error struct for error output from leechcore

memflow-pcileech/src/lib.rs

@@ -124,13 +124,21 @@ impl PciLeech {
     ) -> Result<Self> {
         // open device
         let mut conf = build_lc_config(device, remote, mem_map.is_some());
-        let err = std::ptr::null_mut::<PLC_CONFIG_ERRORINFO>();
-        let handle = unsafe { LcCreateEx(&mut conf, err) };
+        let p_lc_config_error_info = std::ptr::null_mut::<LC_CONFIG_ERRORINFO>();
+        let pp_lc_config_error_info = &raw const p_lc_config_error_info as *mut PLC_CONFIG_ERRORINFO;
+        let handle = unsafe { LcCreateEx(&mut conf, pp_lc_config_error_info) };
         if handle.is_null() {
             // TODO: handle version error
             // TODO: handle special case of fUserInputRequest
+            let err = if p_lc_config_error_info.is_null() {
+                None
+            } else {
+                // read the data at the error
+                Some(unsafe { p_lc_config_error_info.read() })
+            };
+
             return Err(Error(ErrorOrigin::Connector, ErrorKind::Configuration)
-                .log_error(format!("unable to create leechcore context: {err:?}")));
+                .log_error(format!("unable to create leechcore context: {err:?}", )));
         }
 
         // TODO: allow handling these errors properly