Fixed bug #79947

Move the FREE_OP for op_data out of the zend_binary_assign_op_dim_slow()
slow path, so it can be used by the other error path as well. This
makes ASSIGN_DIM_OP structurally more similar to ASSIGN_DIM.

Author: nikic

NEWS

@@ -11,6 +11,8 @@ PHP                                                                        NEWS
   . Fixed bug #79919 (Stack use-after-scope in define()). (cmb)
   . Fixed bug #79934 (CRLF-only line in heredoc causes parsing error).
     (Pieter van den Ham)
+  . Fixed bug #79947 (Memory leak on invalid offset type in compound
+    assignment). (Nikita)
 
 - Gettext:
   . Fixed bug #70574 (Tests fail due to relying on Linux fallback behavior for

Zend/tests/bug79947.phpt

@@ -0,0 +1,13 @@
+--TEST--
+Bug #79947: Memory leak on invalid offset type in compound assignment
+--FILE--
+<?php
+$array = [];
+$key = [];
+$array[$key] += [$key];
+var_dump($array);
+?>
+--EXPECTF--
+Warning: Illegal offset type in %s on line %d
+array(0) {
+}

Zend/zend_execute.c

@@ -2051,8 +2051,6 @@ static zend_never_inline ZEND_COLD void ZEND_FASTCALL zend_use_new_element_for_s
 
 static ZEND_COLD void zend_binary_assign_op_dim_slow(zval *container, zval *dim OPLINE_DC EXECUTE_DATA_DC)
 {
-	zend_free_op free_op_data1;
-
 	if (UNEXPECTED(Z_TYPE_P(container) == IS_STRING)) {
 		if (opline->op2_type == IS_UNUSED) {
 			zend_use_new_element_for_string();
@@ -2063,8 +2061,6 @@ static ZEND_COLD void zend_binary_assign_op_dim_slow(zval *container, zval *dim
 	} else if (EXPECTED(!Z_ISERROR_P(container))) {
 		zend_use_scalar_as_array();
 	}
-	get_op_data_zval_ptr_r((opline+1)->op1_type, (opline+1)->op1, &free_op_data1);
-	FREE_OP(free_op_data1);
 }
 
 static zend_never_inline zend_uchar slow_index_convert(HashTable *ht, const zval *dim, zend_value *value EXECUTE_DATA_DC)

Zend/zend_vm_def.h

@@ -1272,6 +1272,7 @@ ZEND_VM_C_LABEL(assign_dim_op_new_array):
 		} else {
 			zend_binary_assign_op_dim_slow(container, dim OPLINE_CC EXECUTE_DATA_CC);
 ZEND_VM_C_LABEL(assign_dim_op_ret_null):
+			FREE_UNFETCHED_OP_DATA();
 			if (UNEXPECTED(RETURN_VALUE_USED(opline))) {
 				ZVAL_NULL(EX_VAR(opline->result.var));
 			}

Zend/zend_vm_execute.h

@@ -22205,6 +22205,7 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_ASSIGN_DIM_OP_SPEC_VAR_CONST_H
 		} else {
 			zend_binary_assign_op_dim_slow(container, dim OPLINE_CC EXECUTE_DATA_CC);
 assign_dim_op_ret_null:
+			FREE_UNFETCHED_OP((opline+1)->op1_type, (opline+1)->op1.var);
 			if (UNEXPECTED(RETURN_VALUE_USED(opline))) {
 				ZVAL_NULL(EX_VAR(opline->result.var));
 			}
@@ -24494,6 +24495,7 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_ASSIGN_DIM_OP_SPEC_VAR_TMPVAR_
 		} else {
 			zend_binary_assign_op_dim_slow(container, dim OPLINE_CC EXECUTE_DATA_CC);
 assign_dim_op_ret_null:
+			FREE_UNFETCHED_OP((opline+1)->op1_type, (opline+1)->op1.var);
 			if (UNEXPECTED(RETURN_VALUE_USED(opline))) {
 				ZVAL_NULL(EX_VAR(opline->result.var));
 			}
@@ -26898,6 +26900,7 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_ASSIGN_DIM_OP_SPEC_VAR_UNUSED_
 		} else {
 			zend_binary_assign_op_dim_slow(container, dim OPLINE_CC EXECUTE_DATA_CC);
 assign_dim_op_ret_null:
+			FREE_UNFETCHED_OP((opline+1)->op1_type, (opline+1)->op1.var);
 			if (UNEXPECTED(RETURN_VALUE_USED(opline))) {
 				ZVAL_NULL(EX_VAR(opline->result.var));
 			}
@@ -28172,6 +28175,7 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_ASSIGN_DIM_OP_SPEC_VAR_CV_HAND
 		} else {
 			zend_binary_assign_op_dim_slow(container, dim OPLINE_CC EXECUTE_DATA_CC);
 assign_dim_op_ret_null:
+			FREE_UNFETCHED_OP((opline+1)->op1_type, (opline+1)->op1.var);
 			if (UNEXPECTED(RETURN_VALUE_USED(opline))) {
 				ZVAL_NULL(EX_VAR(opline->result.var));
 			}
@@ -39120,6 +39124,7 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_ASSIGN_DIM_OP_SPEC_CV_CONST_HA
 		} else {
 			zend_binary_assign_op_dim_slow(container, dim OPLINE_CC EXECUTE_DATA_CC);
 assign_dim_op_ret_null:
+			FREE_UNFETCHED_OP((opline+1)->op1_type, (opline+1)->op1.var);
 			if (UNEXPECTED(RETURN_VALUE_USED(opline))) {
 				ZVAL_NULL(EX_VAR(opline->result.var));
 			}
@@ -42619,6 +42624,7 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_ASSIGN_DIM_OP_SPEC_CV_TMPVAR_H
 		} else {
 			zend_binary_assign_op_dim_slow(container, dim OPLINE_CC EXECUTE_DATA_CC);
 assign_dim_op_ret_null:
+			FREE_UNFETCHED_OP((opline+1)->op1_type, (opline+1)->op1.var);
 			if (UNEXPECTED(RETURN_VALUE_USED(opline))) {
 				ZVAL_NULL(EX_VAR(opline->result.var));
 			}
@@ -45599,6 +45605,7 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_ASSIGN_DIM_OP_SPEC_CV_UNUSED_H
 		} else {
 			zend_binary_assign_op_dim_slow(container, dim OPLINE_CC EXECUTE_DATA_CC);
 assign_dim_op_ret_null:
+			FREE_UNFETCHED_OP((opline+1)->op1_type, (opline+1)->op1.var);
 			if (UNEXPECTED(RETURN_VALUE_USED(opline))) {
 				ZVAL_NULL(EX_VAR(opline->result.var));
 			}
@@ -47701,6 +47708,7 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_ASSIGN_DIM_OP_SPEC_CV_CV_HANDL
 		} else {
 			zend_binary_assign_op_dim_slow(container, dim OPLINE_CC EXECUTE_DATA_CC);
 assign_dim_op_ret_null:
+			FREE_UNFETCHED_OP((opline+1)->op1_type, (opline+1)->op1.var);
 			if (UNEXPECTED(RETURN_VALUE_USED(opline))) {
 				ZVAL_NULL(EX_VAR(opline->result.var));
 			}