linux-kernel - Re: WARNING in cxacru_cm/usb_submit

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Message-ID: <20240528175907.3525-1-n.zhandarovich@fintech.ru>
Date: Tue, 28 May 2024 10:59:07 -0700
From: Nikita Zhandarovich <n.zhandarovich@...tech.ru>
To: <syzbot+00c18ee8497dd3be6ade@...kaller.appspotmail.com>
CC: Nikita Zhandarovich <n.zhandarovich@...tech.ru>,
	<syzkaller-bugs@...glegroups.com>, <linux-kernel@...r.kernel.org>
Subject: Re: WARNING in cxacru_cm/usb_submit_urb

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
---
 drivers/usb/atm/cxacru.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/atm/cxacru.c b/drivers/usb/atm/cxacru.c
index 4ce7cba2b48a..8a8e94a601c6 100644
--- a/drivers/usb/atm/cxacru.c
+++ b/drivers/usb/atm/cxacru.c
@@ -1131,7 +1131,8 @@ static int cxacru_bind(struct usbatm_data *usbatm_instance,
 	struct cxacru_data *instance;
 	struct usb_device *usb_dev = interface_to_usbdev(intf);
 	struct usb_host_endpoint *cmd_ep = usb_dev->ep_in[CXACRU_EP_CMD];
-	int ret;
+	struct usb_endpoint_descriptor *in, *out;
+	int ret = -1;
 
 	/* instance init */
 	instance = kzalloc(sizeof(*instance), GFP_KERNEL);
@@ -1177,6 +1178,19 @@ static int cxacru_bind(struct usbatm_data *usbatm_instance,
 		goto fail;
 	}
 
+	if (usb_endpoint_xfer_int(&cmd_ep->desc))
+		ret = usb_find_common_endpoints(intf->cur_altsetting,
+						NULL, NULL, &in, &out);
+	else
+		ret = usb_find_common_endpoints(intf->cur_altsetting,
+						&in, &out, NULL, NULL);
+
+	if (ret) {
+		usb_dbg(usbatm_instance, "cxacru_bind: interface has incorrect endpoints\n");
+		ret = -ENODEV;
+		goto fail;
+	}
+
 	if ((cmd_ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 			== USB_ENDPOINT_XFER_INT) {
 		usb_fill_int_urb(instance->rcv_urb,