Fix a stack exhaustion bug in libiberty's demangler when decoding a pathalogically constructed mangled name.

PR 89394
	* cp-demangle.c (cplus_demangle_fill_name): Reject negative
	lengths.
	(d_count_templates_scopes): Replace num_templates and num_scopes
	parameters with a struct d_print_info pointer parameter.  Adjust
	body of the function accordingly.  Add recursion counter and check
	that the recursion limit is not reached.
	(d_print_init): Pass dpi parameter to d_count_templates_scopes.
	Reset recursion counter afterwards, unless the recursion limit was
	reached.

From-SVN: r270258

libiberty/ChangeLog

@@ -1,3 +1,16 @@
+2019-04-10  Nick Clifton  <nickc@redhat.com>
+
+	PR 89394
+	* cp-demangle.c (cplus_demangle_fill_name): Reject negative
+	lengths.
+	(d_count_templates_scopes): Replace num_templates and num_scopes
+	parameters with a struct d_print_info pointer parameter.  Adjust
+	body of the function accordingly.  Add recursion counter and check
+	that the recursion limit is not reached.
+	(d_print_init): Pass dpi parameter to d_count_templates_scopes.
+	Reset recursion counter afterwards, unless the recursion limit was
+	reached.
+
 2019-04-07  Alan Modra  <amodra@gmail.com>
 
 	* functions.texi: Regenerate.

libiberty/cp-demangle.c

@@ -861,7 +861,7 @@ CP_STATIC_IF_GLIBCPP_V3
 int
 cplus_demangle_fill_name (struct demangle_component *p, const char *s, int len)
 {
-  if (p == NULL || s == NULL || len == 0)
+  if (p == NULL || s == NULL || len <= 0)
     return 0;
   p->d_printing = 0;
   p->type = DEMANGLE_COMPONENT_NAME;
@@ -4061,7 +4061,7 @@ d_growable_string_callback_adapter (const char *s, size_t l, void *opaque)
    are larger than the actual numbers encountered.  */
 
 static void
-d_count_templates_scopes (int *num_templates, int *num_scopes,
+d_count_templates_scopes (struct d_print_info *dpi,
 			  const struct demangle_component *dc)
 {
   if (dc == NULL)
@@ -4081,13 +4081,13 @@ d_count_templates_scopes (int *num_templates, int *num_scopes,
       break;
 
     case DEMANGLE_COMPONENT_TEMPLATE:
-      (*num_templates)++;
+      dpi->num_copy_templates++;
       goto recurse_left_right;
 
     case DEMANGLE_COMPONENT_REFERENCE:
     case DEMANGLE_COMPONENT_RVALUE_REFERENCE:
       if (d_left (dc)->type == DEMANGLE_COMPONENT_TEMPLATE_PARAM)
-	(*num_scopes)++;
+	dpi->num_saved_scopes++;
       goto recurse_left_right;
 
     case DEMANGLE_COMPONENT_QUAL_NAME:
@@ -4152,42 +4152,42 @@ d_count_templates_scopes (int *num_templates, int *num_scopes,
     case DEMANGLE_COMPONENT_TAGGED_NAME:
     case DEMANGLE_COMPONENT_CLONE:
     recurse_left_right:
-      d_count_templates_scopes (num_templates, num_scopes,
+      /* PR 89394 - Check for too much recursion.  */
-				d_left (dc));
+      if (dpi->recursion > DEMANGLE_RECURSION_LIMIT)
-      d_count_templates_scopes (num_templates, num_scopes,
+	/* FIXME: There ought to be a way to report to the
-				d_right (dc));
+	   user that the recursion limit has been reached.  */
+	return;
+
+      ++ dpi->recursion;
+      d_count_templates_scopes (dpi, d_left (dc));
+      d_count_templates_scopes (dpi, d_right (dc));
+      -- dpi->recursion;
       break;
 
     case DEMANGLE_COMPONENT_CTOR:
-      d_count_templates_scopes (num_templates, num_scopes,
+      d_count_templates_scopes (dpi, dc->u.s_ctor.name);
-				dc->u.s_ctor.name);
       break;
 
     case DEMANGLE_COMPONENT_DTOR:
-      d_count_templates_scopes (num_templates, num_scopes,
+      d_count_templates_scopes (dpi, dc->u.s_dtor.name);
-				dc->u.s_dtor.name);
       break;
 
     case DEMANGLE_COMPONENT_EXTENDED_OPERATOR:
-      d_count_templates_scopes (num_templates, num_scopes,
+      d_count_templates_scopes (dpi, dc->u.s_extended_operator.name);
-				dc->u.s_extended_operator.name);
       break;
 
     case DEMANGLE_COMPONENT_FIXED_TYPE:
-      d_count_templates_scopes (num_templates, num_scopes,
+      d_count_templates_scopes (dpi, dc->u.s_fixed.length);
-                                dc->u.s_fixed.length);
       break;
 
     case DEMANGLE_COMPONENT_GLOBAL_CONSTRUCTORS:
     case DEMANGLE_COMPONENT_GLOBAL_DESTRUCTORS:
-      d_count_templates_scopes (num_templates, num_scopes,
+      d_count_templates_scopes (dpi, d_left (dc));
-				d_left (dc));
       break;
 
     case DEMANGLE_COMPONENT_LAMBDA:
     case DEMANGLE_COMPONENT_DEFAULT_ARG:
-      d_count_templates_scopes (num_templates, num_scopes,
+      d_count_templates_scopes (dpi, dc->u.s_unary_num.sub);
-				dc->u.s_unary_num.sub);
       break;
     }
 }
@@ -4222,8 +4222,12 @@ d_print_init (struct d_print_info *dpi, demangle_callbackref callback,
   dpi->next_copy_template = 0;
   dpi->num_copy_templates = 0;
 
-  d_count_templates_scopes (&dpi->num_copy_templates,
+  d_count_templates_scopes (dpi, dc);
-			    &dpi->num_saved_scopes, dc);
+  /* If we did not reach the recursion limit, then reset the
+     current recursion value back to 0, so that we can print
+     the templates.  */
+  if (dpi->recursion < DEMANGLE_RECURSION_LIMIT)
+    dpi->recursion = 0;
   dpi->num_copy_templates *= dpi->num_saved_scopes;
 
   dpi->current_template = NULL;