Type check the m_pShadingObj before assuming it's a stream.

core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp

Index: core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp
diff --git a/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp b/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp
index 7b04d8cd3375139136db8654b8e5e67a247964c5..0b6ad48224c808d4d472867a8364bc2f67da0c69 100644
--- a/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp
+++ b/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp
@@ -140,6 +140,12 @@ FX_BOOL CPDF_ShadingPattern::Load() {
     m_pCountedCS = pDocPageData->FindColorSpacePtr(m_pCS->GetArray());
   }
   m_ShadingType = pShadingDict->GetInteger(FX_BSTRC("ShadingType"));
+
+  // We expect to have a stream if our shading type is a mesh.
+  if (m_ShadingType >= 4) {
+    if (!ToStream(m_pShadingObj))

[Tom Sepez, 2015/10/27 16:04:00]

nit: combine with previous if.

[dsinclair, 2015/10/27 16:08:14]

Done.

+      return FALSE;
+  }
   return TRUE;
 }
 FX_BOOL CPDF_ShadingPattern::Reload() {