d-demangle.c (dlang_parse_integer): Fix stack underflow.

     * d-demangle.c (dlang_parse_integer): Fix stack underflow.
     * testsuite/d-demangle-expected: Add testcase.

From-SVN: r270696

libiberty/ChangeLog

 2019-04-30  Ben L  <bobsayshilol@live.co.uk>
 
+	* d-demangle.c (dlang_parse_integer): Fix stack underflow.
+	* testsuite/d-demangle-expected: Add testcase.
+
 	* cp-demangle (d_print_comp_inner): Guard against a NULL 'typed_name'.
 	* testsuite/demangle-expected: Add testcase.
 

libiberty/d-demangle.c

@@ -939,8 +939,8 @@ dlang_parse_integer (string *decl, const char *mangled, char type)
   if (type == 'a' || type == 'u' || type == 'w')
     {
       /* Parse character value.  */
-      char value[10];
-      int pos = 10;
+      char value[20];
+      int pos = sizeof(value);
       int width = 0;
       long val;
 
@@ -991,7 +991,7 @@ dlang_parse_integer (string *decl, const char *mangled, char type)
 	  for (; width > 0; width--)
 	    value[--pos] = '0';
 
-	  string_appendn (decl, &(value[pos]), 10 - pos);
+	  string_appendn (decl, &(value[pos]), sizeof(value) - pos);
 	}
       string_append (decl, "'");
     }

libiberty/testsuite/d-demangle-expected

@@ -1306,3 +1306,7 @@ rt.lifetime._d_newarrayOpT!(_d_newarrayiT)._d_newarrayOpT(const(TypeInfo), ulong
 --format=dlang
 _D4core8demangle16__T6mangleTFZPvZ6mangleFNaNbNfAxaAaZ11DotSplitter5emptyMxFNaNbNdNiNfZb
 core.demangle.mangle!(void*() function).mangle(const(char)[], char[]).DotSplitter.empty() const
+# Could crash
+--format=dlang
+_D8__T2fnVa8888888888888_
+_D8__T2fnVa8888888888888_