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Io\Poll\Context::wait() prevent integer overflow #23468

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Io\Poll\Context::wait() prevent integer overflow #23468

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9 changes: 7 additions & 2 deletions ext/standard/io_poll.c
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Original file line number Diff line number Diff line change
Expand Up @@ -804,12 +804,17 @@ PHP_METHOD(Io_Poll_Context, wait)
if (max_events <= 0) {
max_events = 64;
}
} else if (max_events <= 0) {
} else if (UNEXPECTED(max_events <= 0)) {
zend_argument_value_error(2, "must be greater than 0");
RETURN_THROWS();
#if SIZEOF_INT < SIZEOF_ZEND_LONG
} else if (UNEXPECTED(max_events > INT_MAX)) {
zend_argument_value_error(2, "must be lower than or equal to %d", INT_MAX);

@devnexen devnexen Aug 26, 2026

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nit: must be less than or equal to %d

RETURN_THROWS();
#endif
}

php_poll_event *events = safe_emalloc(max_events, sizeof(*events), 0);
php_poll_event *events = safe_emalloc((size_t) max_events, sizeof(*events), 0);
int num_events = php_poll_wait(intern->ctx, events, (int) max_events, timeout ? &timeout_ts : NULL);

if (num_events < 0) {
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14 changes: 14 additions & 0 deletions ext/standard/tests/poll/poll_ctx_wait.phpt → ...ndard/tests/poll/poll_ctx_wait_error.phpt
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Expand Up @@ -12,13 +12,27 @@ try {
echo $e::class, ': ', $e->getMessage(), PHP_EOL;
}

try {
$poll_ctx->wait(maxEvents: PHP_INT_MIN);
} catch (Throwable $e) {
echo $e::class, ': ', $e->getMessage(), PHP_EOL;
}

try {
$poll_ctx->wait(maxEvents: -1);
} catch (Throwable $e) {
echo $e::class, ': ', $e->getMessage(), PHP_EOL;
}

try {
$poll_ctx->wait(maxEvents: 0);
} catch (Throwable $e) {
echo $e::class, ': ', $e->getMessage(), PHP_EOL;
}

?>
--EXPECT--
ValueError: Io\Poll\Context::wait(): Argument #1 ($timeout) must not be negative
ValueError: Io\Poll\Context::wait(): Argument #2 ($maxEvents) must be greater than 0
ValueError: Io\Poll\Context::wait(): Argument #2 ($maxEvents) must be greater than 0
ValueError: Io\Poll\Context::wait(): Argument #2 ($maxEvents) must be greater than 0
23 changes: 23 additions & 0 deletions ext/standard/tests/poll/poll_ctx_wait_error_int64.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
--TEST--
Io\Poll\Context::wait(): Parameter validation upper limit
--SKIPIF--
<?php
if (PHP_INT_SIZE <= 4) {
die("skip this test is for > 32bit platforms only");
}
?>
--FILE--
<?php
require_once __DIR__ . '/poll.inc';

$poll_ctx = new Io\Poll\Context();

try {
$poll_ctx->wait(maxEvents: PHP_INT_MAX);
} catch (Throwable $e) {
echo $e::class, ': ', $e->getMessage(), PHP_EOL;
}

?>
--EXPECTF--
ValueError: Io\Poll\Context::wait(): Argument #2 ($maxEvents) must be lower than or equal to %d
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