Detect undefined variable usage

dstogov · dstogov · commit 44064529a81d · 2017-08-30T16:02:29.000+03:00
diff --git a/ext/opcache/Optimizer/zend_inference.c b/ext/opcache/Optimizer/zend_inference.c
@@ -4174,6 +4174,11 @@ int zend_may_throw(const zend_op *opline, zend_op_array *op_array, zend_ssa *ssa
 		case ZEND_UNSET_VAR:
 			return (t1 & (MAY_BE_OBJECT|MAY_BE_RESOURCE|MAY_BE_ARRAY_OF_OBJECT|MAY_BE_ARRAY_OF_RESOURCE|MAY_BE_ARRAY_OF_ARRAY));
 		case ZEND_ASSIGN_DIM:
+			if ((opline+1)->op1_type == IS_CV) {
+				if (_ssa_op1_info(op_array, ssa, opline+1) & MAY_BE_UNDEF) {
+					return 1;
+				}
+			}
 			return (t1 & (MAY_BE_OBJECT|MAY_BE_RESOURCE|MAY_BE_TRUE|MAY_BE_STRING|MAY_BE_LONG|MAY_BE_DOUBLE)) || opline->op2_type == IS_UNUSED ||
 				(t2 & (MAY_BE_UNDEF|MAY_BE_ARRAY|MAY_BE_OBJECT|MAY_BE_RESOURCE));
 		case ZEND_ASSIGN_OBJ:
