forcepoint: fix null ptr deref.

Change-Id: I867a4332d666bf4a0e38e93c0c7918fb106958c6

external/libstaroffice/0001-fix-null-ptr-deref.-if-decryption-failed.patch.1

+From 59f29dd735bf5890ea29fdde809afcf111463a65 Mon Sep 17 00:00:00 2001
+From: David Tardon <dtardon@redhat.com>
+Date: Mon, 12 Mar 2018 20:33:54 +0100
+Subject: [PATCH] fix null ptr deref. if decryption failed
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Thanks to Antti Levomäki and Christian Jalio from Forcepoint.
+---
+ src/lib/StarObjectDraw.cxx | 7 ++++---
+ 1 file changed, 4 insertions(+), 3 deletions(-)
+
+diff --git a/src/lib/StarObjectDraw.cxx b/src/lib/StarObjectDraw.cxx
+index fd3411a..8a19b1c 100644
+--- a/src/lib/StarObjectDraw.cxx
++++ b/src/lib/StarObjectDraw.cxx
+@@ -199,10 +199,11 @@ try
+        if the user mask does correspond to the real mask.
+     */
+     input=StarEncryption::decodeStream(input, StarEncryption::getMaskToDecodeStream(firstByte, 0x44));
+-    if (input) {
+-      zone.setInput(input);
+-      input->seek(0, librevenge::RVNG_SEEK_SET);
++    if (!input) {
++      STOFF_DEBUG_MSG(("StarObjectDraw::readDrawDocument: decryption failed\n"));
++      return false;
+     }
++    zone.setInput(input);
+   }
+   input->seek(0, librevenge::RVNG_SEEK_SET);
+   std::shared_ptr<StarObjectModel> model(new StarObjectModel(*this, true));
+-- 
+2.14.3
+

external/libstaroffice/UnpackedTarball_libstaroffice.mk

@@ -37,4 +37,8 @@ $(eval $(call gb_UnpackedTarball_add_patches,libstaroffice, \
 ))
 endif
 
+$(eval $(call gb_UnpackedTarball_add_patches,libstaroffice, \
+	external/libstaroffice/0001-fix-null-ptr-deref.-if-decryption-failed.patch.1 \
+))
+
 # vim: set noet sw=4 ts=4: