Commit b05aebc2 authored by Johan Hovold's avatar Johan Hovold

USB: serial: mos7720: fix NULL-deref at open

Fix NULL-pointer dereference at port open if a device lacks the expected
bulk in and out endpoints.

Unable to handle kernel NULL pointer dereference at virtual address 00000030
...
[<bf071c20>] (mos7720_open [mos7720]) from [<bf0490e0>] (serial_port_activate+0x68/0x98 [usbserial])
[<bf0490e0>] (serial_port_activate [usbserial]) from [<c0470ca4>] (tty_port_open+0x9c/0xe8)
[<c0470ca4>] (tty_port_open) from [<bf049d98>] (serial_open+0x48/0x6c [usbserial])
[<bf049d98>] (serial_open [usbserial]) from [<c0469178>] (tty_open+0xcc/0x5cc)

Fixes: 0f64478c ("USB: add USB serial mos7720 driver")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
parent 21ce5784
...@@ -1917,6 +1917,11 @@ static int mos7720_startup(struct usb_serial *serial) ...@@ -1917,6 +1917,11 @@ static int mos7720_startup(struct usb_serial *serial)
u16 product; u16 product;
int ret_val; int ret_val;
if (serial->num_bulk_in < 2 || serial->num_bulk_out < 2) {
dev_err(&serial->interface->dev, "missing bulk endpoints\n");
return -ENODEV;
}
product = le16_to_cpu(serial->dev->descriptor.idProduct); product = le16_to_cpu(serial->dev->descriptor.idProduct);
dev = serial->dev; dev = serial->dev;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment