# https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-5951
# https://bugs.ghostscript.com/show_bug.cgi?id=697548

commit bfa6b2ecbe48edc69a7d9d22a12419aed25960b8
Author: Chris Liddell <chris.liddell@artifex.com>
Date:   Thu Apr 6 16:44:54 2017 +0100

    Bug 697548: use the correct param list enumerator
    
    When we encountered dictionary in a ref_param_list, we were using the enumerator
    for the "parent" param_list, rather than the enumerator for the param_list
    we just created for the dictionary. That parent was usually the stack
    list enumerator, and caused a segfault.
    
    Using the correct enumerator works better.

diff --git a/psi/iparam.c b/psi/iparam.c
index 4e63b6d25..b2fa85fa2 100644
--- a/psi/iparam.c
+++ b/psi/iparam.c
@@ -770,12 +770,13 @@ ref_param_read_typed(gs_param_list * plist, gs_param_name pkey,
                 gs_param_enumerator_t enumr;
                 gs_param_key_t key;
                 ref_type keytype;
+                dict_param_list *dlist = (dict_param_list *) pvalue->value.d.list;
 
                 param_init_enumerator(&enumr);
-                if (!(*((iparam_list *) plist)->enumerate)
-                    ((iparam_list *) pvalue->value.d.list, &enumr, &key, &keytype)
+                if (!(*(dlist->enumerate))
+                    ((iparam_list *) dlist, &enumr, &key, &keytype)
                     && keytype == t_integer) {
-                    ((dict_param_list *) pvalue->value.d.list)->int_keys = 1;
+                    dlist->int_keys = 1;
                     pvalue->type = gs_param_type_dict_int_keys;
                 }
             }