1 files changed, 12 insertions, 1 deletions
diff --git a/src/test/fuzz/util.h b/src/test/fuzz/util.h
index b70ea6d90e..9c7b0d47a2 100644
--- a/src/test/fuzz/util.h
+++ b/src/test/fuzz/util.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -120,4 +120,15 @@ NODISCARD bool MultiplicationOverflow(const T i, const T j) noexcept
     }
 }
 
+template <class T>
+NODISCARD bool AdditionOverflow(const T i, const T j) noexcept
+{
+    static_assert(std::is_integral<T>::value, "Integral required.");
+    if (std::numeric_limits<T>::is_signed) {
+        return (i > 0 && j > std::numeric_limits<T>::max() - i) ||
+               (i < 0 && j < std::numeric_limits<T>::min() - i);
+    }
+    return std::numeric_limits<T>::max() - i < j;
+}
+
 #endif // BITCOIN_TEST_FUZZ_UTIL_H