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LibJS: Only update EC instruction pointer when pushing to EC stack

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Instead of trying to keep a live reference to the bytecode interpreter's
current instruction stream iterator, we now simply copy the current
iterator whenever pushing to the ExecutionContext stack.

This fixes a stack-use-after-return issue reported by ASAN.
This commit is contained in:
Andreas Kling
2023-09-02 17:38:17 +02:00
parent 2966188ea3
commit c78506d79b
4 changed files with 19 additions and 15 deletions
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Userland/Libraries/LibJS/Bytecode/Interpreter.cpp
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@@ -201,7 +201,6 @@ Interpreter::ValueAndFrame Interpreter::run_and_return_frame(Realm& realm, Execu
for (;;) {
auto pc = InstructionStreamIterator { m_current_block->instruction_stream(), m_current_executable };
TemporaryChange temp_change { m_pc, Optional<InstructionStreamIterator&>(pc) };
TemporaryChange context_change { vm().running_execution_context().instruction_stream_iterator, Optional<InstructionStreamIterator&>(pc) };
// FIXME: This is getting kinda spaghetti-y
bool will_jump = false;