[PATCH 6.1 021/102] usb: xhci: prevent potential failure in handle_tx_event() for Transfer events without TRB

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6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Niklas Neronin <niklas.neronin@xxxxxxxxxxxxxxx>

[ 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 <niklas.neronin@xxxxxxxxxxxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240429140245.3955523-11-mathias.nyman@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 7549c430c4f01..be5b0ff2966fe 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2631,16 +2631,17 @@ static int handle_tx_event(struct xhci_hcd *xhci,
 			else
 				xhci_handle_halted_endpoint(xhci, ep, 0, 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 */
-- 
2.43.0







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