Added sanity checks for height and difficulty

src/pool_block.h

@@ -53,6 +53,12 @@ static constexpr uint64_t MAX_BLOCK_SIZE = 128 * 1024 - 5;
 // 0.6 XMR
 static constexpr uint64_t BASE_BLOCK_REWARD = 600000000000ULL;
 
+// 1000 years at 1 TH/s. It should be enough for any normal use.
+static constexpr difficulty_type MAX_CUMULATIVE_DIFFICULTY{ 13019633956666736640ULL, 1710ULL };
+
+// 1000 years at 1 block/second. It should be enough for any normal use.
+static constexpr uint64_t MAX_SIDECHAIN_HEIGHT = 31556952000ULL;
+
 struct DifficultyData
 {
 	FORCEINLINE DifficultyData(uint64_t t, const difficulty_type& d) : m_timestamp(t), m_cumulativeDifficulty(d) {}

src/pool_block_parser.inl

@@ -306,12 +306,20 @@ int PoolBlock::deserialize(const uint8_t* data, size_t size, const SideChain& si
 
 		READ_VARINT(m_sidechainHeight);
 
+		if (m_sidechainHeight > MAX_SIDECHAIN_HEIGHT) {
+			return __LINE__;
+		}
+
 		READ_VARINT(m_difficulty.lo);
 		READ_VARINT(m_difficulty.hi);
 
 		READ_VARINT(m_cumulativeDifficulty.lo);
 		READ_VARINT(m_cumulativeDifficulty.hi);
 
+		if (m_cumulativeDifficulty > MAX_CUMULATIVE_DIFFICULTY) {
+			return __LINE__;
+		}
+
 		READ_BUF(m_sidechainExtraBuf, sizeof(m_sidechainExtraBuf));
 
 #undef READ_BYTE