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Fix zend_jit_undefined_long_key overwriting dim when dim == result

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Fixes oss-fuzz #64727
Closes GH-12900
This commit is contained in:
Ilija Tovilo 2023-12-08 12:56:30 +01:00
parent ff22409082
commit 623da03845
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GPG Key ID: A4F5D403F118200A
3 changed files with 33 additions and 2 deletions
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4
NEWS
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@ -6,6 +6,10 @@ PHP NEWS
. Fix incorrect timeout in built-in web server when using router script and
max_input_time. (ilutov)
- Opcache:
. Fixed oss-fuzz #64727 (JIT undefined array key warning may overwrite DIM
with NULL when DIM is the same var as result). (ilutov)
21 Dec 2023, PHP 8.2.14
- Core:

4
ext/opcache/jit/zend_jit_vm_helpers.c
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@ -205,7 +205,6 @@ void ZEND_FASTCALL zend_jit_undefined_long_key(EXECUTE_DATA_D)
zval *result = EX_VAR(opline->result.var);
zval *dim;
ZVAL_NULL(result);
if (opline->op2_type == IS_CONST) {
dim = RT_CONSTANT(opline, opline->op2);
} else {
@ -213,6 +212,7 @@ void ZEND_FASTCALL zend_jit_undefined_long_key(EXECUTE_DATA_D)
}
ZEND_ASSERT(Z_TYPE_P(dim) == IS_LONG);
zend_error(E_WARNING, "Undefined array key " ZEND_LONG_FMT, Z_LVAL_P(dim));
ZVAL_NULL(result);
}
void ZEND_FASTCALL zend_jit_undefined_string_key(EXECUTE_DATA_D)
@ -222,7 +222,6 @@ void ZEND_FASTCALL zend_jit_undefined_string_key(EXECUTE_DATA_D)
zval *dim;
zend_ulong lval;
ZVAL_NULL(result);
if (opline->op2_type == IS_CONST) {
dim = RT_CONSTANT(opline, opline->op2);
} else {
@ -234,6 +233,7 @@ void ZEND_FASTCALL zend_jit_undefined_string_key(EXECUTE_DATA_D)
} else {
zend_error(E_WARNING, "Undefined array key \"%s\"", Z_STRVAL_P(dim));
}
ZVAL_NULL(result);
}
ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_profile_helper(ZEND_OPCODE_HANDLER_ARGS)

27
ext/opcache/tests/jit/oss-fuzz-64727.phpt Normal file
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@ -0,0 +1,27 @@
--TEST--
oss-fuzz #64727
--INI--
opcache.enable_cli=1
opcache.jit_buffer_size=64M
opcache.jit=function
--EXTENSIONS--
opcache
--FILE--
<?php
function test(){
$a = null;
$b = null;
for($i = 0; $i < 2; $i++){
$a = $a + $b;
var_dump($a);
$a = @[3][$a];
var_dump($a);
}
}
test();
?>
--EXPECT--
int(0)
int(3)
int(3)
NULL