File CVE-2017-9216.patch of Package ghostscript.7320

From 3ebffb1d96ba0cacec23016eccb4047dab365853 Mon Sep 17 00:00:00 2001
From: Shailesh Mistry <shailesh.mistry@hotmail.co.uk>
Date: Wed, 24 May 2017 19:29:57 +0100
Subject: [PATCH] Bug 697934: Fix SEGV due to error code being ignored.

The return code from jbig2_decode_text_region was being ignored so the
code continued to try and parse the invalid file using incomplete/empty
structures.
---
 jbig2dec/jbig2_symbol_dict.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: ghostscript-9.15/jbig2dec/jbig2_symbol_dict.c
===================================================================
--- ghostscript-9.15.orig/jbig2dec/jbig2_symbol_dict.c
+++ ghostscript-9.15/jbig2dec/jbig2_symbol_dict.c
@@ -558,9 +558,12 @@ jbig2_decode_symbol_dict(Jbig2Ctx *ctx,
 		      }
 
 		      /* multiple symbols are handled as a text region */
-		      jbig2_decode_text_region(ctx, segment, tparams, (const Jbig2SymbolDict * const *)refagg_dicts,
+		      code = jbig2_decode_text_region(ctx, segment, tparams, (const Jbig2SymbolDict * const *)refagg_dicts,
 			  n_refagg_dicts, image, data, size, GR_stats, as, ws);
 
+                      if (code < 0)
+                          goto cleanup4;
+
 		      SDNEWSYMS->glyphs[NSYMSDECODED] = image;
 		      refagg_dicts[0]->glyphs[params->SDNUMINSYMS + NSYMSDECODED] = jbig2_image_clone(ctx, SDNEWSYMS->glyphs[NSYMSDECODED]);
 		  } else {