cp-demangle.c (d_encoding): Guard against NULL return values from d_right (dc).

     * cp-demangle.c (d_encoding): Guard against NULL return values from
     d_right (dc).
     * testsuite/demangle-expected: Add testcase.

From-SVN: r270694

libiberty/ChangeLog

+2019-04-30  Ben L  <bobsayshilol@live.co.uk>
+
+	* cp-demangle.c (d_encoding): Guard against NULL return values from
+	d_right (dc).
+	* testsuite/demangle-expected: Add testcase.
+
 2019-04-29  Ben L  <bobsayshilol@live.co.uk>
 
 	* cp-demangle.c (d_expression_1): Don't peek ahead unless the current

libiberty/cp-demangle.c

@@ -1330,8 +1330,14 @@ d_encoding (struct d_info *di, int top_level)
 	     really apply here; this happens when parsing a class
 	     which is local to a function.  */
 	  if (dc->type == DEMANGLE_COMPONENT_LOCAL_NAME)
-	    while (is_fnqual_component_type (d_right (dc)->type))
-	      d_right (dc) = d_left (d_right (dc));
+	    {
+	      while (d_right (dc) != NULL
+		     && is_fnqual_component_type (d_right (dc)->type))
+		d_right (dc) = d_left (d_right (dc));
+
+	      if (d_right (dc) == NULL)
+		dc = NULL;
+	    }
 	}
       else
 	{

libiberty/testsuite/demangle-expected

@@ -72,6 +72,11 @@ _Q8ccQ4M2e.
 
 _ZmmAtl
 _ZmmAtl
+# Could crash
+--no-params
+_ZZaSFvOEES_
+_ZZaSFvOEES_
+_ZZaSFvOEES_
 #
 # demangler/80513 Test for bogus characters after __thunk_