Prevent divide by zeros in CJBig2_GSIDProc::decode_MMR().

core/src/fxcodec/jbig2/JBig2_Context.cpp

Index: core/src/fxcodec/jbig2/JBig2_Context.cpp
diff --git a/core/src/fxcodec/jbig2/JBig2_Context.cpp b/core/src/fxcodec/jbig2/JBig2_Context.cpp
index 2e2cf9eeee264ae06e1b8c3dc81fd3243bbe3c04..f2c44b726aeb8562d00395ecf3ef7b05d6b3f019 100644
--- a/core/src/fxcodec/jbig2/JBig2_Context.cpp
+++ b/core/src/fxcodec/jbig2/JBig2_Context.cpp
@@ -1127,6 +1127,11 @@ int32_t CJBig2_Context::parseHalftoneRegion(CJBig2_Segment* pSegment,
     nRet = JBIG2_ERROR_TOO_SHORT;
     goto failed;
   }
+  if (pHRD->HGW == 0 || pHRD->HGH == 0) {
+    nRet = JBIG2_ERROR_FATAL;
+    goto failed;
+  }
+
   pHRD->HBW = ri.width;
   pHRD->HBH = ri.height;
   pHRD->HMMR = cFlags & 0x01;