Commit 276aae5b authored by Johan Hovold's avatar Johan Hovold Committed by Sasha Levin

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

[ Upstream commit 90507d54 ]

Fix NULL-pointer dereference at open should the device lack a bulk-in or
bulk-out endpoint:

Unable to handle kernel NULL pointer dereference at virtual address 00000030
...
PC is at iuu_open+0x78/0x59c [iuu_phoenix]

Fixes: 07c3b1a1 ("USB: remove broken usb-serial num_endpoints
check")
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 fe436258
......@@ -68,6 +68,16 @@ struct iuu_private {
u32 clk;
};
static int iuu_attach(struct usb_serial *serial)
{
unsigned char num_ports = serial->num_ports;
if (serial->num_bulk_in < num_ports || serial->num_bulk_out < num_ports)
return -ENODEV;
return 0;
}
static int iuu_port_probe(struct usb_serial_port *port)
{
struct iuu_private *priv;
......@@ -1196,6 +1206,7 @@ static struct usb_serial_driver iuu_device = {
.tiocmset = iuu_tiocmset,
.set_termios = iuu_set_termios,
.init_termios = iuu_init_termios,
.attach = iuu_attach,
.port_probe = iuu_port_probe,
.port_remove = iuu_port_remove,
};
......
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