The patch has been taken from community and fixes Integer overflow.
The details can be found in the following location
https://bugs.ghostscript.com/show_bug.cgi?id=697169
https://bugs.ghostscript.com/show_bug.cgi?id=697178

--- ghostscript-9.20/base/gsicc_manage.c	2016-09-26 03:41:28.000000000 -0700
+++ ghostscript-9.20/base/gsicc_manage.c	2016-10-24 00:36:45.674351452 -0700
@@ -1124,10 +1124,12 @@
     }
 
     /* First just try it like it is */
-    str = sfopen(pname, "r", mem_gc);
-    if (str != NULL) {
-        *strp = str;
-        return 0;
+    if (gs_check_file_permission(mem_gc, pname, namelen, "r") >= 0) {
+        str = sfopen(pname, "r", mem_gc);
+        if (str != NULL) {
+            *strp = str;
+            return 0;
+        }
     }
 
     /* If that fails, try %rom% */ /* FIXME: Not sure this is needed or correct */
--- ghostscript-9.20/base/gslibctx.c	2016-09-26 03:41:28.000000000 -0700
+++ ghostscript-9.20/base/gslibctx.c	2016-10-24 01:18:05.789733804 -0700
@@ -184,6 +184,7 @@
         return -1;
     }
     
+    pio->client_check_file_permission = NULL;
     gp_get_realtime(pio->real_time_0);
 
     /* Set scanconverter to 1 (default) */
@@ -335,4 +336,14 @@
     if (!mem->gs_lib_ctx->stderr_fn)
         fflush(mem->gs_lib_ctx->fstderr);
     /* else nothing to flush */
+}
+
+int
+gs_check_file_permission (gs_memory_t *mem, const char *fname, const int len, const char *permission)
+{
+    int code = 0;
+    if (mem->gs_lib_ctx->client_check_file_permission != NULL) {
+        code = mem->gs_lib_ctx->client_check_file_permission(mem, fname, len, permission);
+    }
+    return code;
 }
--- ghostscript-9.20/base/gslibctx.h	2016-10-24 01:25:56.499696028 -0700
+++ ghostscript-9.20/base/gslibctx.h	2016-10-24 01:30:29.901389710 -0700
@@ -32,6 +32,9 @@
 #  define gs_font_dir_DEFINED
 typedef struct gs_font_dir_s gs_font_dir;
 #endif
+
+typedef int (*client_check_file_permission_t) (gs_memory_t *mem, const char *fname, const int len, const char *permission);
+
 typedef struct gs_lib_ctx_s
 {
     gs_memory_t *memory;  /* mem->gs_lib_ctx->memory == mem */
@@ -61,6 +64,7 @@
     struct gx_io_device_s **io_device_table;
     int io_device_table_count;
     int io_device_table_size;
+    client_check_file_permission_t client_check_file_permission;
     /* Define the default value of AccurateScreens that affects setscreen
        and setcolorscreen. */
     bool screen_accurate_screens;
@@ -132,6 +136,9 @@
 gs_lib_ctx_get_default_device_list(const gs_memory_t *mem, char** dev_list_str,
                         int *list_str_len);
 
+int
+gs_check_file_permission (gs_memory_t *mem, const char *fname, const int len, const char *permission);
+
 #define IS_LIBCTX_STDOUT(mem, f) (f == mem->gs_lib_ctx->fstdout)
 #define IS_LIBCTX_STDERR(mem, f) (f == mem->gs_lib_ctx->fstderr)
 
--- ghostscript-9.20/psi/imain.c	2016-09-26 03:41:29.000000000 -0700
+++ ghostscript-9.20/psi/imain.c	2016-10-24 01:35:34.401393925 -0700
@@ -57,6 +57,7 @@
 #include "ivmspace.h"
 #include "idisp.h"              /* for setting display device callback */
 #include "iplugin.h"
+#include "zfile.h"
 
 #ifdef PACIFY_VALGRIND
 #include "valgrind.h"
@@ -212,6 +213,7 @@
                                            "the_gs_name_table");
             if (code < 0)
                 return code;
+            mem->gs_lib_ctx->client_check_file_permission = z_check_file_permissions;
         }
         code = obj_init(&minst->i_ctx_p, &idmem);  /* requires name_init */
         if (code < 0)
--- ghostscript-9.20/psi/int.mak	2016-09-26 03:41:29.000000000 -0700
+++ ghostscript-9.20/psi/int.mak	2016-10-24 01:40:57.724230623 -0700
@@ -2024,7 +2024,7 @@
  $(ialloc_h) $(iconf_h) $(idebug_h) $(idict_h) $(idisp_h) $(iinit_h)\
  $(iname_h) $(interp_h) $(iplugin_h) $(isave_h) $(iscan_h) $(ivmspace_h)\
  $(iinit_h) $(main_h) $(oper_h) $(ostack_h)\
- $(sfilter_h) $(store_h) $(stream_h) $(strimpl_h)\
+ $(sfilter_h) $(store_h) $(stream_h) $(strimpl_h) $(zfile_h)\
  $(INT_MAK) $(MAKEDIRS)
 	$(PSCC) $(PSO_)imain.$(OBJ) $(C_) $(PSSRC)imain.c
 
--- ghostscript-9.20/psi/zfile.c	2016-09-26 03:41:29.000000000 -0700
+++ ghostscript-9.20/psi/zfile.c	2016-10-24 02:03:17.926910315 -0700
@@ -197,6 +197,25 @@
     return check_file_permissions_reduced(i_ctx_p, fname_reduced, rlen, permitgroup);
 }
 
+/* z_check_file_permissions: see zfile.h for explanation
+*/
+int
+z_check_file_permissions(gs_memory_t *mem, const char *fname, const int len, const char *permission)
+{
+    i_ctx_t *i_ctx_p = get_minst_from_memory(mem)->i_ctx_p;
+    gs_parsed_file_name_t pname;
+    char *permitgroup = permission[0] == 'r' ? "PermitFileReading" : "PermitFileWriting";
+    int code = gs_parse_file_name(&pname, fname, len, imemory);
+    if (code < 0)
+        return code;
+
+    if (pname.iodev && i_ctx_p->LockFilePermissions && strcmp(pname.iodev->dname, "%pipe%") == 0)
+        return gs_error_invalidfileaccess;
+
+    code = check_file_permissions(i_ctx_p, fname, len, permitgroup);
+    return code;
+}
+
 /* <name_string> <access_string> file <file> */
 int                             /* exported for zsysvm.c */
 zfile(i_ctx_t *i_ctx_p)
--- ghostscript-9.20/psi/zfile.h	2016-09-26 03:41:29.000000000 -0700
+++ ghostscript-9.20/psi/zfile.h	2016-10-24 02:09:06.285022717 -0700
@@ -22,4 +22,11 @@
 int zopen_file(i_ctx_t *i_ctx_p, const gs_parsed_file_name_t *pfn,
            const char *file_access, stream **ps, gs_memory_t *mem);
 
+/* z_check_file_permissions: a callback (via mem->gs_lib_ctx->client_check_file_permission)
+ * to allow applying the above permissions checks when opening file(s) from
+ * the graphics library
+ */
+int
+z_check_file_permissions(gs_memory_t *mem, const char *fname,
+                                 const int len, const char *permission);
 #endif

--- ghostscript-9.20/psi/zfile.c	2016-09-26 03:41:29.000000000 -0700
+++ ghostscript-9.20/psi/zfile.c	2016-11-23 22:09:45.180922117 -0800
@@ -1081,6 +1081,9 @@
     gs_main_instance *minst = get_minst_from_memory(mem);
     int code;
 
+    if (i_ctx_p && starting_arg_file)
+        i_ctx_p->starting_arg_file = false;
+
     /* when starting arg files (@ files) iodev_default is not yet set */
     if (iodev == 0)
         iodev = (gx_io_device *)gx_io_device_table[0];