fix: convert result of allocate_mappings from signed to unsigned (#473)

mozilla · Dec 19, 2022 · 4e304db · 4e304db
1 parent ef55f77
commit 4e304db
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/lib/source-map-consumer.js b/lib/source-map-consumer.js
@@ -301,7 +301,9 @@ class BasicSourceMapConsumer extends SourceMapConsumer {
     const aStr = this._mappings;
     const size = aStr.length;
 
-    const mappingsBufPtr = this._wasm.exports.allocate_mappings(size);
+    // Interpret signed result of allocate_mappings as unsigned, otherwise
+    // addresses higher than 2GB will be negative.
+    const mappingsBufPtr = this._wasm.exports.allocate_mappings(size) >>> 0;
     const mappingsBuf = new Uint8Array(
       this._wasm.exports.memory.buffer,
       mappingsBufPtr,