prevent integer overflow

Author: maxdml

dbos/conductor.go

@@ -876,6 +876,10 @@ func (c *Conductor) handleForkWorkflowRequest(data []byte, requestID string) err
 	if req.Body.StartStep < 0 {
 		return fmt.Errorf("invalid StartStep: cannot be negative")
 	}
+	// Additional validation to prevent integer overflow when converting to uint
+	if req.Body.StartStep > math.MaxInt {
+		return fmt.Errorf("invalid StartStep: value too large")
+	}
 	input := ForkWorkflowInput{
 		OriginalWorkflowID: req.Body.WorkflowID,
 		StartStep:          uint(req.Body.StartStep),