fixup! [libevmasm] Add support to import evm assembly json.

Author: cameel

libevmasm/Assembly.cpp

@@ -585,7 +585,24 @@ std::pair<std::shared_ptr<Assembly>, std::vector<std::string>> Assembly::fromJSO
 			}
 			else if (dataItem.isObject())
 			{
-				size_t index = static_cast<size_t>(std::stoi(dataItemID));
+				size_t index{};
+				try
+				{
+					// Using signed variant because stoul() still accepts negative numbers and
+					// just lets them wrap around.
+					int parsedDataItemID = std::stoi(dataItemID);
+					solRequire(parsedDataItemID >= 0, AssemblyImportException, "The key '" + dataItemID + "' inside '.data' is out of the supported integer range.");
+					index = static_cast<size_t>(parsedDataItemID);
+				}
+				catch (std::invalid_argument const&)
+				{
+					solThrow(AssemblyImportException, "The key '" + dataItemID + "' inside '.data' is not an integer.");
+				}
+				catch (std::out_of_range const&)
+				{
+					solThrow(AssemblyImportException, "The key '" + dataItemID + "' inside '.data' is out of the supported integer range.");
+				}
+
 				if (result->m_subs.size() <= index)
 					result->m_subs.resize(index + 1);
 				std::shared_ptr<Assembly> subassembly(Assembly::fromJSON(dataItem, sourceList, _level + 1).first);