From: Oliver Neukum <oneukum@suse.com>
To: syzkaller-bugs@googlegroups.com, netdev@vger.kernel.org,
linux-usb@vger.kernel.org, davem@davemloft.net, kuba@kernel.org
Cc: Oliver Neukum <oneukum@suse.com>,
syzbot+76bb1d34ffa0adc03baa@syzkaller.appspotmail.com
Subject: [PATCHv2] usbnet: sanity check for maxpacket
Date: Thu, 21 Oct 2021 14:29:44 +0200 [thread overview]
Message-ID: <20211021122944.21816-1-oneukum@suse.com> (raw)
maxpacket of 0 makes no sense and oopses as we need to divide
by it. Give up.
V2: fixed typo in log and stylistic issues
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Reported-by: syzbot+76bb1d34ffa0adc03baa@syzkaller.appspotmail.com
---
drivers/net/usb/usbnet.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 840c1c2ab16a..80432ee0ce69 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1788,6 +1788,10 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
if (!dev->rx_urb_size)
dev->rx_urb_size = dev->hard_mtu;
dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
+ if (dev->maxpacket == 0) {
+ /* that is a broken device */
+ goto out4;
+ }
/* let userspace know we have a random address */
if (ether_addr_equal(net->dev_addr, node_id))
--
2.26.2
next reply other threads:[~2021-10-21 12:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-21 12:29 Oliver Neukum [this message]
2021-10-21 12:38 ` [PATCHv2] usbnet: sanity check for maxpacket Johan Hovold
2021-10-21 15:10 ` patchwork-bot+netdevbpf
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