WebKit: JSC: Incorrect optimization in BytecodeGenerator::emitGetByVal(CVE-2017-7061)

Let's start with JS code. let o = ; for let i in xx: 0 oi; 0; i-- ForInContext& context = mforInContextStacki - 1.get; if context.local != property continue; if !context.isValid break; if context.type == ForInContext::IndexedForInContextType property = staticcastcontext.index; break;...

WebKit JSC BytecodeGenerator::emitGetByVal Incorrect Optimization

WebKit: JSC: Incorrect optimization in BytecodeGenerator::emitGetByVal CVE-2017-7061 Let's start with JS code. let o = ; for let i in xx: 0 oi; 0; i-- ForInContext& context = mforInContextStacki - 1.get; if context.local != property continue; if !context.isValid break; if context.type ==...

WebKit JSC - 'BytecodeGenerator::emitGetByVal' Incorrect Optimization (1)

Let's start with JS code. let o = ; for let i in xx: 0 oi; 0; i-- ForInContext& context = mforInContextStacki - 1.get; if context.local != property continue; if !context.isValid break; if context.type == ForInContext::IndexedForInContextType property = staticcastcontext.index; break;...