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USB: serial: kobil_sct: fix NULL-deref in write 

Fix NULL-pointer dereference in write() should the device lack the
expected interrupt-out endpoint:

Unable to handle kernel NULL pointer dereference at virtual address 00000054
...
PC is at kobil_write+0x144/0x2a0 [kobil_sct]

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2017-01-03 16:39:49 +01:00
parent 5d9b0f859b
commit 21ce578402
1 changed files with 12 additions and 0 deletions
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12
drivers/usb/serial/kobil_sct.c
View File

@ -51,6 +51,7 @@
/* Function prototypes */
static int kobil_attach(struct usb_serial *serial);
static int kobil_port_probe(struct usb_serial_port *probe);
static int kobil_port_remove(struct usb_serial_port *probe);
static int kobil_open(struct tty_struct *tty, struct usb_serial_port *port);
@ -86,6 +87,7 @@ static struct usb_serial_driver kobil_device = {
.description = "KOBIL USB smart card terminal",
.id_table = id_table,
.num_ports = 1,
.attach = kobil_attach,
.port_probe = kobil_port_probe,
.port_remove = kobil_port_remove,
.ioctl = kobil_ioctl,
@ -113,6 +115,16 @@ struct kobil_private {
};
static int kobil_attach(struct usb_serial *serial)
{
if (serial->num_interrupt_out < serial->num_ports) {
dev_err(&serial->interface->dev, "missing interrupt-out endpoint\n");
return -ENODEV;
}
return 0;
}
static int kobil_port_probe(struct usb_serial_port *port)
{
struct usb_serial *serial = port->serial;