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Fix use-of-uninitialized-value with ??= on assert #11581

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Fix use-of-uninitialized-value with ??= on assert #11581

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13 changes: 13 additions & 0 deletions Zend/tests/gh11580.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
--TEST--
GH-11580: assert() with ??= operator can lead to use-of-uninitialized-value
--INI--
zend.assertions=0
--FILE--
<?php
assert(y)[y] ??= y;
?>
--EXPECTF--
Fatal error: Uncaught Error: Undefined constant "y" in %s:%d
Stack trace:
#0 {main}
thrown in %s on line %d
6 changes: 6 additions & 0 deletions Zend/zend_compile.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4083,6 +4083,10 @@ static void zend_compile_assert(znode *result, zend_ast_list *args, zend_string
zend_op *opline;
uint32_t check_op_number = get_next_op_number();

/* Assert expression may not be memoized and reused as it may not actually be evaluated. */
int orig_memoize_mode = CG(memoize_mode);
CG(memoize_mode) = ZEND_MEMOIZE_NONE;

zend_emit_op(NULL, ZEND_ASSERT_CHECK, NULL, NULL);

if (fbc && fbc_is_finalized(fbc)) {
Expand Down Expand Up @@ -4116,6 +4120,8 @@ static void zend_compile_assert(znode *result, zend_ast_list *args, zend_string
opline = &CG(active_op_array)->opcodes[check_op_number];
opline->op2.opline_num = get_next_op_number();
SET_NODE(opline->result, result);

CG(memoize_mode) = orig_memoize_mode;
} else {
if (!fbc) {
zend_string_release_ex(name, 0);
Expand Down