linux-kernel - Re: [syzbot] WARNING in carl9170_usb_send_rx_irq_urb/usb_submit

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Date: Wed, 3 Apr 2024 07:47:24 -0700
From: Nikita Zhandarovich <n.zhandarovich@...tech.ru>
To: <syzbot+0ae4804973be759fa420@...kaller.appspotmail.com>
CC: Nikita Zhandarovich <n.zhandarovich@...tech.ru>,
	<syzkaller-bugs@...glegroups.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [syzbot] WARNING in carl9170_usb_send_rx_irq_urb/usb_submit_urb

Verify endpoints in carl9170_usb_probe, leave with error if any
are missing.

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
---
 drivers/net/wireless/ath/carl9170/usb.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/net/wireless/ath/carl9170/usb.c b/drivers/net/wireless/ath/carl9170/usb.c
index c4edf8355941..66d2ad561fd3 100644
--- a/drivers/net/wireless/ath/carl9170/usb.c
+++ b/drivers/net/wireless/ath/carl9170/usb.c
@@ -1069,6 +1069,33 @@ static int carl9170_usb_probe(struct usb_interface *intf,
 			ar->usb_ep_cmd_is_bulk = true;
 	}
 
+	/* Verify that all expected endpoints are present */
+	if (ar->usb_ep_cmd_is_bulk) {
+		u8 bulk_ep_addr[] = {
+			AR9170_USB_EP_RX | USB_DIR_IN,
+			AR9170_USB_EP_TX | USB_DIR_OUT,
+			AR9170_USB_EP_CMD | USB_DIR_OUT,
+			0};
+		u8 int_ep_addr[] = {
+			AR9170_USB_EP_IRQ | USB_DIR_IN,
+			0};
+		if (!usb_check_bulk_endpoints(intf, bulk_ep_addr) ||
+		    !usb_check_int_endpoints(intf, int_ep_addr))
+			return -ENODEV;
+	} else {
+		u8 bulk_ep_addr[] = {
+			AR9170_USB_EP_RX | USB_DIR_IN,
+			AR9170_USB_EP_TX | USB_DIR_OUT,
+			0};
+		u8 int_ep_addr[] = {
+			AR9170_USB_EP_IRQ | USB_DIR_IN,
+			AR9170_USB_EP_CMD | USB_DIR_OUT,
+			0};
+		if (!usb_check_bulk_endpoints(intf, bulk_ep_addr) ||
+		    !usb_check_int_endpoints(intf, int_ep_addr))
+			return -ENODEV;
+	}
+
 	usb_set_intfdata(intf, ar);
 	SET_IEEE80211_DEV(ar->hw, &intf->dev);