@@ -33,8 +33,9 @@ Core and Builtins
   alpha 2, including: (1) a serious 'wrong output' bug that could
   occur for long (> 40 digit) input strings, (2) a crash in dtoa.c
   that occurred in debug builds when parsing certain long numeric
-  strings corresponding to subnormal values, and (3) a number of flaws
-  that could lead to incorrectly rounded results.
+  strings corresponding to subnormal values, (3) a memory leak for
+  some values large enough to cause overflow, and (4) a number of
+  flaws that could lead to incorrectly rounded results.
 
 - The __complex__ method is now looked up on the class of instances to make it
   consistent with other special methods.
 
@@ -1939,8 +1939,14 @@ _Py_dg_strtod(const char *s00, char **se)
             dval(&rv) += adj.d;
             if ((word0(&rv) & Exp_mask) >=
                 Exp_msk1*(DBL_MAX_EXP+Bias-P)) {
-                if (word0(&rv0) == Big0 && word1(&rv0) == Big1)
+                if (word0(&rv0) == Big0 && word1(&rv0) == Big1) {
+                    Bfree(bb);
+                    Bfree(bd);
+                    Bfree(bs);
+                    Bfree(bd0);
+                    Bfree(delta);
                     goto ovfl;
+                }
                 word0(&rv) = Big0;
                 word1(&rv) = Big1;
                 goto cont;