usb: dwc3: gadget: fix for possible endpoint disable race

when we call dwc3_gadget_giveback(), we end up
releasing our controller's lock. Another thread
could get scheduled and disable the endpoint,
subsequently setting dep->endpoint.desc to NULL.

In that case, we would end up dereferencing a NULL
pointer which would result in a Kernel Oops. Let's
avoid the problem by simply returning early if we
have a NULL descriptor.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 867adc9..b59893c 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2041,6 +2041,14 @@ static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
                        break;
        } while (1);
 
+       /*
+        * Our endpoint might get disabled by another thread during
+        * dwc3_gadget_giveback(). If that happens, we're just gonna return 1
+        * early on so DWC3_EP_BUSY flag gets cleared
+        */
+       if (!dep->endpoint.desc)
+               return 1;
+
        if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
                        list_empty(&dep->started_list)) {
                if (list_empty(&dep->pending_list)) {
@@ -2078,7 +2086,7 @@ static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
                status = -ECONNRESET;
 
        clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status);
-       if (clean_busy && (is_xfer_complete ||
+       if (clean_busy && (!dep->endpoint.desc || is_xfer_complete ||
                                usb_endpoint_xfer_isoc(dep->endpoint.desc)))
                dep->flags &= ~DWC3_EP_BUSY;
 
@@ -2107,6 +2115,14 @@ static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
                dwc->u1u2 = 0;
        }
 
+       /*
+        * Our endpoint might get disabled by another thread during
+        * dwc3_gadget_giveback(). If that happens, we're just gonna return 1
+        * early on so DWC3_EP_BUSY flag gets cleared
+        */
+       if (!dep->endpoint.desc)
+               return;
+
        if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
                int ret;