[PATCH v1] usb: xhci: Check return value of wait for TRB_TRANSFER event
Minda Chen
minda.chen at starfivetech.com
Tue Oct 17 08:20:16 CEST 2023
xhci_wait_for_event() waiting TRB_TRANSFER event may return
NULL. Checking the return value to avoid crash.
Signed-off-by: Minda Chen <minda.chen at starfivetech.com>
---
drivers/usb/host/xhci-ring.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index c8260cbdf9..5f02ff0769 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -544,6 +544,8 @@ static void abort_td(struct usb_device *udev, int ep_index)
xhci_queue_command(ctrl, 0, udev->slot_id, ep_index, TRB_STOP_RING);
event = xhci_wait_for_event(ctrl, TRB_TRANSFER);
+ if (!event)
+ return;
field = le32_to_cpu(event->trans_event.flags);
BUG_ON(TRB_TO_SLOT_ID(field) != udev->slot_id);
BUG_ON(TRB_TO_EP_INDEX(field) != ep_index);
--
2.17.1
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