Bison 1.30: memory leak in yyparse

[Per Allansson]

Hi,

I am using bison 1.30 on HP-UX 11.00. There is a memory
leak in yyparse (unless alloca is used of course) if the stacks
need to be expanded more than once - the old stacks must be freed -
see patch below.

/Per (address@hidden)

--- bison.simple.orig        Wed Oct 10 17:04:56 2001
+++ bison.simple     Thu Nov  8 16:45:55 2001
@@ -429,10 +429,20 @@
       yyvs = (YYSTYPE *) YYSTACK_ALLOC (yystacksize * sizeof (*yyvsp));
       __yy_memcpy ((char *)yyvs, (char *)yyvs1,
                   size * (unsigned int) sizeof (*yyvsp));
+# if !YYSTACK_USE_ALLOCA
+      if (yyss1 != yyssa)
+          free (yyss1);
+      if (yyvs1 != yyvsa)
+          free (yyvs1);
+# endif
 # if YYLSP_NEEDED
       yyls = (YYLTYPE *) YYSTACK_ALLOC (yystacksize * sizeof (*yylsp));
       __yy_memcpy ((char *)yyls, (char *)yyls1,
                   size * (unsigned int) sizeof (*yylsp));
+# endif
+# if !YYSTACK_USE_ALLOCA
+      if (yyls1 != yylsa)
+          free (yyls1);
 # endif
 #endif /* no yyoverflow */