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Fix GH-16591: Assertion error in shm_put_var #16610

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Fix GH-16591: Assertion error in shm_put_var #16610

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6 changes: 6 additions & 0 deletions ext/sysvshm/sysvshm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -257,6 +257,12 @@ PHP_FUNCTION(shm_put_var)
php_var_serialize(&shm_var, arg_var, &var_hash);
PHP_VAR_SERIALIZE_DESTROY(var_hash);

if (UNEXPECTED(!shm_list_ptr->ptr)) {
smart_str_free(&shm_var);
zend_throw_error(NULL, "Shared memory block has been destroyed by the serialization function");
RETURN_THROWS();
}

/* insert serialized variable into shared memory */
ret = php_put_shm_data(shm_list_ptr->ptr, shm_key, shm_var.s? ZSTR_VAL(shm_var.s) : NULL, shm_var.s? ZSTR_LEN(shm_var.s) : 0);

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25 changes: 25 additions & 0 deletions ext/sysvshm/tests/gh16591.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,25 @@
--TEST--
GH-16591 (Assertion error in shm_put_var)
--EXTENSIONS--
sysvshm
--FILE--
<?php

class C {
function __serialize(): array {
global $mem;
shm_detach($mem);
return ['a' => 'b'];
}
}

$mem = shm_attach(1);
try {
shm_put_var($mem, 1, new C);
} catch (Error $e) {
echo $e->getMessage(), "\n";
}

?>
--EXPECT--
Shared memory block has been destroyed by the serialization function
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