--- IO-AIO/AIO.xs	2012/05/28 17:00:19	1.214
+++ IO-AIO/AIO.xs	2012/06/17 17:07:25	1.215
@@ -1217,7 +1217,10 @@
           {
             /* read: check type and grow scalar as necessary */
             SvUPGRADE (data, SVt_PV);
-            svptr = SvGROW (data, len + dataoffset + 1);
+            if (SvLEN (data) >= SvCUR (data))
+              svptr = SvGROW (data, len + dataoffset + 1);
+            else if (SvCUR (data) < len + dataoffset)
+              croak ("length + dataoffset outside of scalar, and cannot grow");
           }
 
         {