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Kernel/USB: Explicitely copy descriptor.hub_characteristics for printing

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This field is in a packed struct, which makes it possibly misaligned.
This knowledge is lost when invoking `dbgln` triggering an unaligned
access to it, aka UB. By explicitely copying it we avoid this issue.
This commit is contained in:
Hendiadyoin1 2023-08-31 16:49:31 +02:00 • committed by Andrew Kaster
parent c9a4ab9987
commit 8335803045
1 changed files with 1 additions and 1 deletions
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Kernel/Bus/USB/USBHub.cpp
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@ -72,7 +72,7 @@ ErrorOr<void> Hub::enumerate_and_power_on_hub()
if constexpr (USB_DEBUG) {
dbgln("USB Hub Descriptor for {:04x}:{:04x}", m_vendor_id, m_product_id);
dbgln("Number of Downstream Ports: {}", descriptor.number_of_downstream_ports);
dbgln("Hub Characteristics: 0x{:04x}", descriptor.hub_characteristics);
dbgln("Hub Characteristics: 0x{:04x}", static_cast<u16>(descriptor.hub_characteristics));
dbgln("Power On to Power Good Time: {} ms ({} * 2ms)", descriptor.power_on_to_power_good_time * 2, descriptor.power_on_to_power_good_time);
dbgln("Hub Controller Current: {} mA", descriptor.hub_controller_current);
}