From 26288448120b28af1dfd85a6fa6b6d55a16c7f2f Mon Sep 17 00:00:00 2001
From: Albert Wang <albertccwang@google.com>
Date: Tue, 9 Nov 2021 17:26:42 +0800
Subject: [PATCH] usb: dwc3: gadget: Fix null pointer exception
Git-commit: 26288448120b28af1dfd85a6fa6b6d55a16c7f2f
Patch-mainline: v5.16-rc3
References: git-fixes
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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 daa8f8548a2e..7e3db00e9759 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -3263,6 +3263,9 @@ 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)
@@ -3310,6 +3313,9 @@ 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);
--
2.31.1