netdev - [PATCH net] usb: net: sierra: check for no status endpoint

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Message-ID: <20250714111326.258378-1-oneukum@suse.com>
Date: Mon, 14 Jul 2025 13:12:56 +0200
From: Oliver Neukum <oneukum@...e.com>
To: andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	linux-usb@...r.kernel.org,
	netdev@...r.kernel.org
Cc: Oliver Neukum <oneukum@...e.com>,
	syzbot+3f89ec3d1d0842e95d50@...kaller.appspotmail.com
Subject: [PATCH net] usb: net: sierra: check for no status endpoint

The driver checks for having three endpoints and
having bulk in and out endpoints, but not that
the third endpoint is interrupt input.
Rectify the omission.

Reported-by: syzbot+3f89ec3d1d0842e95d50@...kaller.appspotmail.com
Closes: https://lore.kernel.org/linux-usb/686d5a9f.050a0220.1ffab7.0017.GAE@google.com/
Tested-by: syzbot+3f89ec3d1d0842e95d50@...kaller.appspotmail.com
Fixes: eb4fd8cd355c8 ("net/usb: add sierra_net.c driver")
Signed-off-by: Oliver Neukum <oneukum@...e.com>
---
 drivers/net/usb/sierra_net.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/usb/sierra_net.c b/drivers/net/usb/sierra_net.c
index c30ca415d1d3..36c73db44f77 100644
--- a/drivers/net/usb/sierra_net.c
+++ b/drivers/net/usb/sierra_net.c
@@ -689,6 +689,10 @@ static int sierra_net_bind(struct usbnet *dev, struct usb_interface *intf)
 			status);
 		return -ENODEV;
 	}
+	if (!dev->status) {
+		dev_err(&dev->udev->dev, "No status endpoint found");
+		return -ENODEV;
+	}
 	/* Initialize sierra private data */
 	priv = kzalloc(sizeof *priv, GFP_KERNEL);
 	if (!priv)
-- 
2.50.0