On Fri, Oct 09, 2020 at 02:55:08PM -0700, syzbot wrote:
> Hello,
> 
> syzbot tried to test the proposed patch but the build/boot failed:
> 
> drivers/net/wireless/ath/ath9k/hif_usb.c:1319:7: error: implicit declaration 
> of function 'usb_find_bulk_in'; did you mean 'usb_fill_bulk_urb'? 
> [-Werror=implicit-function-declaration]

Let's try again, using a different repository.

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
v5.9-rc8

Index: usb-devel/drivers/net/wireless/ath/ath9k/hif_usb.c
===================================================================
--- usb-devel.orig/drivers/net/wireless/ath/ath9k/hif_usb.c
+++ usb-devel/drivers/net/wireless/ath/ath9k/hif_usb.c
@@ -1307,6 +1307,20 @@ static int ath9k_hif_usb_probe(struct us
        struct usb_device *udev = interface_to_usbdev(interface);
        struct hif_device_usb *hif_dev;
        int ret = 0;
+       struct usb_host_interface *alt;
+       struct usb_endpoint_descriptor *epd;
+
+       /* Verify the expected endpoints are present */
+       alt = interface->cur_altsetting;
+       if (!usb_find_int_in_endpoint(alt, &epd) ||
+                       usb_endpoint_num(epd) != USB_REG_IN_PIPE ||
+           !usb_find_int_out_endpoint(alt, &epd) ||
+                       usb_endpoint_num(epd) != USB_REG_OUT_PIPE ||
+           !usb_find_bulk_in(endpoint(alt, &epd) ||
+                       usb_endpoint_num(epd) != USB_WLAN_RX_PIPE ||
+           !usb_find_bulk_out(endpoint(alt, &epd) ||
+                       usb_endpoint_num(epd) != USB_WLAN_TX_PIPE)
+               return -ENODEV;
 
        if (id->driver_info == STORAGE_DEVICE)
                return send_eject_command(interface);

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