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usb: dwc3: gadget: Fix null pointer exception

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commit 26288448120b28af1dfd85a6fa6b6d55a16c7f2f upstream.

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.

Fixes: f09ddcfcb8c5 ("usb: dwc3: gadget: Prevent EP queuing while stopping transfers")
Cc: stable <stable@vger.kernel.org>
Reviewed-by: Jack Pham <quic_jackp@quicinc.com>
Signed-off-by: Albert Wang <albertccwang@google.com>
Link: https://lore.kernel.org/r/20211109092642.3507692-1-albertccwang@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Albert Wang 2021-11-09 17:26:42 +08:00 committed by Greg Kroah-Hartman
parent 140e2df472
commit 0755f3f322
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/dwc3/gadget.c
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@ -2918,6 +2918,9 @@ 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)
@ -2965,6 +2968,9 @@ 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);