gnu/packages/patches/ghostscript-CVE-2016-7979.patch

   1 The following patch was adapted for GNU Ghostscript
   2 by Mark H Weaver <mhw@netris.org> based on:
   3
   4 http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=875a0095f37626a721c7ff57d606a0f95af03913
   5
   6 From 875a0095f37626a721c7ff57d606a0f95af03913 Mon Sep 17 00:00:00 2001
   7 From: Ken Sharp <ken.sharp@artifex.com>
   8 Date: Wed, 5 Oct 2016 10:10:58 +0100
   9 Subject: [PATCH] DSC parser - validate parameters
  10
  11 Bug #697190 ".initialize_dsc_parser doesn't validate the parameter is a dict type before using it."
  12
  13 Regardless of any security implications, its simply wrong for a PostScript
  14 operator not to validate its parameter(s).
  15
  16 No differences expected.
  17 ---
  18  psi/zdscpars.c | 13 +++++++++----
  19  1 file changed, 9 insertions(+), 4 deletions(-)
  20
  21 diff --git a/psi/zdscpars.c b/psi/zdscpars.c
  22 index c05e154..9b4b605 100644
  23 --- a/psi/zdscpars.c
  24 +++ b/psi/zdscpars.c
  25 @@ -150,11 +150,16 @@ zinitialize_dsc_parser(i_ctx_t *i_ctx_p)
  26      ref local_ref;
  27      int code;
  28      os_ptr const op = osp;
  29 -    dict * const pdict = op->value.pdict;
  30 -    gs_memory_t * const mem = (gs_memory_t *)dict_memory(pdict);
  31 -    dsc_data_t * const data =
  32 -        gs_alloc_struct(mem, dsc_data_t, &st_dsc_data_t, "DSC parser init");
  33 +    dict *pdict;
  34 +    gs_memory_t *mem;
  35 +    dsc_data_t *data;
  36
  37 +    check_read_type(*op, t_dictionary);
  38 +
  39 +    pdict = op->value.pdict;
  40 +    mem = (gs_memory_t *)dict_memory(pdict);
  41 +
  42 +    data = gs_alloc_struct(mem, dsc_data_t, &st_dsc_data_t, "DSC parser init");
  43      if (!data)
  44          return_error(e_VMerror);
  45      data->document_level = 0;
  46 --
  47 2.9.1
  48