From d2ce12f1315bf38df34edfef86701d4bc4f0db35 Mon Sep 17 00:00:00 2001
From: Alon Zakai <alonzakai@gmail.com>
Date: Fri, 29 Mar 2019 17:45:42 -0700
Subject: avoid risky iterator addition (#1970)

Not an actual problem, but hits an assertion in D_GLIBCXX_DEBUG, and is likely UB.
---
 src/wasm/wasm-binary.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/wasm/wasm-binary.cpp b/src/wasm/wasm-binary.cpp
index 02987f5f7..18bd48e2a 100644
--- a/src/wasm/wasm-binary.cpp
+++ b/src/wasm/wasm-binary.cpp
@@ -394,7 +394,7 @@ void WasmBinaryWriter::writeDataSegments() {
         if (combined.data.size() < needed) {
           combined.data.resize(needed);
         }
-        std::copy(segment.data.begin(), segment.data.end(), combined.data.begin() + offset - start);
+        std::copy(segment.data.begin(), segment.data.end(), combined.data.begin() + (offset - start));
       }
       emit(combined);
       break;
-- 
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