From 9a24eb8010c2dc6a2eba56e3eb9fc07d14ffe00a Mon Sep 17 00:00:00 2001 From: Niklas Neronin Date: Mon, 29 Apr 2024 17:02:37 +0300 Subject: [PATCH] usb: xhci: prevent potential failure in handle_tx_event() for Transfer events without TRB [ Upstream commit 66cb618bf0bb82859875b00eeffaf223557cb416 ] Some transfer events don't always point to a TRB, and consequently don't have a endpoint ring. In these cases, function handle_tx_event() should not proceed, because if 'ep->skip' is set, the pointer to the endpoint ring is used. To prevent a potential failure and make the code logical, return after checking the completion code for a Transfer event without TRBs. Signed-off-by: Niklas Neronin Signed-off-by: Mathias Nyman Link: https://lore.kernel.org/r/20240429140245.3955523-11-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/host/xhci-ring.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 8dd85221cd92..592dabc78515 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -2649,16 +2649,17 @@ static int handle_tx_event(struct xhci_hcd *xhci, else xhci_handle_halted_endpoint(xhci, ep, NULL, EP_SOFT_RESET); - goto cleanup; + break; case COMP_RING_UNDERRUN: case COMP_RING_OVERRUN: case COMP_STOPPED_LENGTH_INVALID: - goto cleanup; + break; default: xhci_err(xhci, "ERROR Transfer event for unknown stream ring slot %u ep %u\n", slot_id, ep_index); goto err_out; } + return 0; } /* Count current td numbers if ep->skip is set */