From: Jianqiang Tang <jianqiang.tang@xxxxxxxxx>
Do sanity check for usb request complete function as we hit random
null pointer kernel panic in giveback function.
>From the call trace, show the complete function should be null.
So we add the sanity check before every usb request queue to dwc3
also before dwc3 giveback the usb request.
Logs:
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [< (null)>] (null)
Call Trace:
? dwc3_gadget_giveback+0xa5/0x130
? vsnprintf+0x166/0x3d0
dwc3_remove_requests+0x57/0x70
__dwc3_gadget_ep_disable+0x18/0x80
dwc3_gadget_ep_disable+0x79/0x1a0
linkwatch_fire_event+0x4c/0x90
gether_disconnect+0x45/0x1b0
? wake_up_klogd+0x49/0x70
console_unlock+0x295/0x4c0
rndis_disable+0x3d/0x90
preempt_count_add+0x55/0xa0
reset_config+0x3b/0x90
_raw_spin_lock_irqsave+0x25/0x30
composite_disconnect+0x2f/0x50
dwc3_gadget_disconnect_interrupt+0x62/0x90
Signed-off-by: Jianqiang Tang <jianqiang.tang@xxxxxxxxx>
---
drivers/usb/dwc3/gadget.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 2363bad..3c1ac95 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -268,7 +268,8 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
trace_dwc3_gadget_giveback(req);
spin_unlock(&dwc->lock);
- usb_gadget_giveback_request(&dep->endpoint, &req->request);
+ if (req->request.complete)
+ usb_gadget_giveback_request(&dep->endpoint, &req->request);
spin_lock(&dwc->lock);
}
@@ -1233,6 +1234,16 @@ static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
int ret;
spin_lock_irqsave(&dwc->lock, flags);
+
+ if (WARN(!request->complete, "request %p complete function is NULL\n",
+ request)) {
+ dwc3_trace(trace_dwc3_gadget,
+ "request %p complete function is NULL\n",
+ request);
+ spin_unlock_irqrestore(&dwc->lock, flags);
+ return -EINVAL;
+ }
+
ret = __dwc3_gadget_ep_queue(dep, req);
/*
--
1.9.1
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