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The following patch was adapted for GNU Ghostscript
by Mark H Weaver <mhw@netris.org> based on:
http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=875a0095f37626a721c7ff57d606a0f95af03913
From 875a0095f37626a721c7ff57d606a0f95af03913 Mon Sep 17 00:00:00 2001
From: Ken Sharp <ken.sharp@artifex.com>
Date: Wed, 5 Oct 2016 10:10:58 +0100
Subject: [PATCH] DSC parser - validate parameters
Bug #697190 ".initialize_dsc_parser doesn't validate the parameter is a dict type before using it."
Regardless of any security implications, its simply wrong for a PostScript
operator not to validate its parameter(s).
No differences expected.
---
psi/zdscpars.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/psi/zdscpars.c b/psi/zdscpars.c
index c05e154..9b4b605 100644
--- a/psi/zdscpars.c
+++ b/psi/zdscpars.c
@@ -150,11 +150,16 @@ zinitialize_dsc_parser(i_ctx_t *i_ctx_p)
ref local_ref;
int code;
os_ptr const op = osp;
- dict * const pdict = op->value.pdict;
- gs_memory_t * const mem = (gs_memory_t *)dict_memory(pdict);
- dsc_data_t * const data =
- gs_alloc_struct(mem, dsc_data_t, &st_dsc_data_t, "DSC parser init");
+ dict *pdict;
+ gs_memory_t *mem;
+ dsc_data_t *data;
+ check_read_type(*op, t_dictionary);
+
+ pdict = op->value.pdict;
+ mem = (gs_memory_t *)dict_memory(pdict);
+
+ data = gs_alloc_struct(mem, dsc_data_t, &st_dsc_data_t, "DSC parser init");
if (!data)
return_error(e_VMerror);
data->document_level = 0;
--
2.9.1
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