Add SB Curated (copied from the smartbugs repository).

dataset/arithmetic/overflow_single_tx.sol

@@ -0,0 +1,51 @@
+/*
+ * @source: https://github.com/ConsenSys/evm-analyzer-benchmark-suite
+ * @author: Suhabe Bugrara
+ * @vulnerable_at_lines: 18,24,30,36,42,48
+ */
+
+//Single transaction overflow
+//Post-transaction effect: overflow escapes to publicly-readable storage
+
+pragma solidity ^0.4.23;
+
+contract IntegerOverflowSingleTransaction {
+    uint public count = 1;
+
+    // ADD overflow with result stored in state variable.
+    function overflowaddtostate(uint256 input) public {
+        // <yes> <report> ARITHMETIC
+        count += input;
+    }
+
+    // MUL overflow with result stored in state variable.
+    function overflowmultostate(uint256 input) public {
+        // <yes> <report> ARITHMETIC
+        count *= input;
+    }
+
+    // Underflow with result stored in state variable.
+    function underflowtostate(uint256 input) public {
+        // <yes> <report> ARITHMETIC
+        count -= input;
+    }
+
+    // ADD Overflow, no effect on state.
+    function overflowlocalonly(uint256 input) public {
+        // <yes> <report> ARITHMETIC
+        uint res = count + input;
+    }
+
+    // MUL Overflow, no effect on state.
+    function overflowmulocalonly(uint256 input) public {
+        // <yes> <report> ARITHMETIC
+        uint res = count * input;
+    }
+
+    // Underflow, no effect on state.
+    function underflowlocalonly(uint256 input) public {
+        // <yes> <report> ARITHMETIC
+       	uint res = count - input;
+    }
+
+}