server: Validate status in continue_debug_event.

dlls/ntdll/tests/exception.c

@@ -1000,6 +1000,10 @@ static void test_debugger(void)
         continuestatus = DBG_CONTINUE;
         ok(WaitForDebugEvent(&de, INFINITE), "reading debug event\n");
 
+        ret = ContinueDebugEvent(de.dwProcessId, de.dwThreadId, 0xdeadbeef);
+        ok(!ret, "ContinueDebugEvent unexpectedly succeeded\n");
+        ok(GetLastError() == ERROR_INVALID_PARAMETER, "Unexpected last error: %u\n", GetLastError());
+
         if (de.dwThreadId != pi.dwThreadId)
         {
             trace("event %d not coming from main thread, ignoring\n", de.dwDebugEventCode);

server/debugger.c

@@ -612,8 +612,16 @@ DECL_HANDLER(wait_debug_event)
 /* Continue a debug event */
 DECL_HANDLER(continue_debug_event)
 {
-    struct process *process = get_process_from_id( req->pid );
-    if (process)
+    struct process *process;
+
+    if (req->status != DBG_EXCEPTION_NOT_HANDLED &&
+        req->status != DBG_CONTINUE)
+    {
+        set_error( STATUS_INVALID_PARAMETER );
+        return;
+    }
+
+    if ((process = get_process_from_id( req->pid )))
     {
         struct thread *thread = get_thread_from_id( req->tid );
         if (thread)