Commit 51ecc07f authored by Johan Hovold's avatar Johan Hovold Committed by Sasha Levin

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

[ Upstream commit b05aebc2 ]

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>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent d6e7aa70
......@@ -1897,6 +1897,11 @@ static int mos7720_startup(struct usb_serial *serial)
u16 product;
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);
dev = serial->dev;
......
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