Fix a heap overflow in CJBig2_Context::parseSymbolDict

core/src/fxcodec/jbig2/JBig2_GeneralDecoder.cpp

Index: core/src/fxcodec/jbig2/JBig2_GeneralDecoder.cpp
diff --git a/core/src/fxcodec/jbig2/JBig2_GeneralDecoder.cpp b/core/src/fxcodec/jbig2/JBig2_GeneralDecoder.cpp
index 6179317890730cdf83a133f0bec2c03c7ed31e72..53faab4a464599ee057a9543cafa260bf6ecfe7b 100644
--- a/core/src/fxcodec/jbig2/JBig2_GeneralDecoder.cpp
+++ b/core/src/fxcodec/jbig2/JBig2_GeneralDecoder.cpp
@@ -61,6 +61,8 @@ extern const JBig2ArithQe QeTable[] = {
     { 0x5601, 46, 46, 0 }
 };
 
+extern const unsigned int JBIG2_QE_NUM = sizeof(QeTable) / sizeof(JBig2ArithQe);
+
 CJBig2_Image *CJBig2_GRDProc::decode_Arith(CJBig2_ArithDecoder *pArithDecoder, JBig2ArithCtx *gbContext)
 {
     if (GBW == 0 || GBH == 0) {