WebKit JIT ByteCodeParser::handleIntrinsicCall Type Confusion

WebKit: JIT: Type confusion bugs in ByteCodeParser::handleIntrinsicCall CVE-2018-4382 case ArrayPushIntrinsic: ... if staticcastargumentCountIncludingThis = MINSPARSEARRAYINDEX return false; ArrayMode arrayMode = getArrayModemcurrentInstructionOPCODELENGTHopcall - 2.u.arrayProfile, Array::Write;...

WebKit JIT - 'ByteCodeParser::handleIntrinsicCall' Type Confusion

/ case ArrayPushIntrinsic: ... if staticcastargumentCountIncludingThis = MINSPARSEARRAYINDEX return false; ArrayMode arrayMode = getArrayModemcurrentInstructionOPCODELENGTHopcall - 2.u.arrayProfile, Array::Write; ... This code always assumes that the current instruction is an opcall instruction...