On Thu, Nov 04, 2021 at 02:26:16PM +0800, Albert Wang wrote:
> In the endpoint interrupt functions
> dwc3_gadget_endpoint_transfer_in_progress() and
> dwc3_gadget_endpoint_trbs_complete() will dereference the endpoint
> descriptor. But it could be cleared in __dwc3_gadget_ep_disable()
> when accessory disconnected. So we need to check whether it is null
> or not before dereferencing it.
>
> Signed-off-by: Albert Wang <albertccwang@xxxxxxxxxx>
Nice catch. I think this might have been caused when the call to
dwc3_remove_requests() in __dwc3_gadget_ep_disable() was moved after
the endpoint descriptors is cleared. So you can probably add:
Fixes: f09ddcfcb8c5 ("usb: dwc3: gadget: Prevent EP queuing while
stopping transfers").
Reviewed-by: Jack Pham <quic_jackp@xxxxxxxxxxx>
> ---
> drivers/usb/dwc3/gadget.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index 23de2a5a40d6..83c7344888fd 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -3252,6 +3252,9 @@ static bool dwc3_gadget_endpoint_trbs_complete(struct dwc3_ep *dep,
> struct dwc3 *dwc = dep->dwc;
> bool no_started_trb = true;
>
> + if (!dep->endpoint.desc)
> + return no_started_trb;
> +
> dwc3_gadget_ep_cleanup_completed_requests(dep, event, status);
>
> if (dep->flags & DWC3_EP_END_TRANSFER_PENDING)
> @@ -3299,6 +3302,9 @@ static void dwc3_gadget_endpoint_transfer_in_progress(struct dwc3_ep *dep,
> {
> int status = 0;
>
> + if (!dep->endpoint.desc)
> + return;
> +
> if (usb_endpoint_xfer_isoc(dep->endpoint.desc))
> dwc3_gadget_endpoint_frame_from_event(dep, event);
>
> --
> 2.33.1.1089.g2158813163f-goog
>
