Bug 1764737 - Add missing OOM checks in GeneralParser<ParseHandler, Unit>::exportFrom. r=mgaudet

Differential Revision: https://phabricator.services.mozilla.com/D143751

js/src/frontend/Parser.cpp

@@ -5703,6 +5703,9 @@ GeneralParser<ParseHandler, Unit>::exportFrom(uint32_t begin, Node specList) {
 
   ListNodeType importAssertionList =
       handler_.newList(ParseNodeKind::ImportAssertionList, pos());
+  if (!importAssertionList) {
+    return null();
+  }
   if (tt == TokenKind::Assert) {
     tokenStream.consumeKnownToken(TokenKind::Assert,
                                   TokenStream::SlashIsRegExp);
@@ -5718,6 +5721,9 @@ GeneralParser<ParseHandler, Unit>::exportFrom(uint32_t begin, Node specList) {
 
   BinaryNodeType moduleRequest = handler_.newModuleRequest(
       moduleSpec, importAssertionList, TokenPos(moduleSpecPos, pos().end));
+  if (!moduleRequest) {
+    return null();
+  }
 
   BinaryNodeType node =
       handler_.newExportFromDeclaration(begin, specList, moduleRequest);

js/src/jit-test/tests/parser/bug-1764737.js

@@ -0,0 +1,9 @@
+// |jit-test| skip-if: !('oomTest' in this); --fuzzing-safe; --ion-offthread-compile=off
+
+function r(src) {
+  oomTest(function() {
+      parseModule(src);
+  });
+}
+r("export * from 'y';");
+r("export * from 'y';");