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usb_serial: fix possible NULL pointer dereference

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There can apparently be interfaces without descriptors.

Should fix #17892

Change-Id: Ibcbab0f60ecbd2005640c647bf7540d17d0f5375
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5598
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: waddlesplash <[email protected]>
This commit is contained in:
PulkoMandy
2022-09-09 21:00:34 +00:00
committed by waddlesplash
parent 6021345a33
commit 8d1a3621dc
1 changed files with 4 additions and 0 deletions
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src/add-ons/kernel/drivers/ports/usb_serial/ACM.cpp
+4
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@@ -30,7 +30,11 @@ ACMDevice::AddDevice(const usb_configuration_info *config)
// Search ACM Communication Interface
for (size_t i = 0; i < config->interface_count && status < B_OK; i++) {
usb_interface_info *interface = config->interface[i].active;
if (interface == NULL)
continue;
usb_interface_descriptor *descriptor = interface->descr;
if (descriptor == NULL)
continue;
if (descriptor->interface_class != USB_CDC_COMMUNICATION_INTERFACE_CLASS
|| descriptor->interface_subclass != USB_CDC_COMMUNICATION_INTERFACE_ACM_SUBCLASS)
continue;