diff options
| author | Johan Hovold <johan@kernel.org> | 2017-01-03 16:39:59 +0100 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2017-06-17 15:48:24 +0200 |
| commit | 6052b3570801ea4a03177a2d5550379e5219a51b (patch) | |
| tree | f95b82c566f5db00fe867de5d725ebd507949da9 /drivers/usb/serial | |
| parent | a72c29ad1a15e596dd6be8312b1186f4ccdbfc43 (diff) | |
USB: serial: oti6858: fix NULL-deref at open
commit 5afeef2366db14587b65558bbfd5a067542e07fb upstream.
Fix NULL-pointer dereference in open() should the device lack the
expected endpoints:
Unable to handle kernel NULL pointer dereference at virtual address 00000030
...
PC is at oti6858_open+0x30/0x1d0 [oti6858]
Note that a missing interrupt-in endpoint would have caused open() to
fail.
Fixes: 49cdee0ed0fc ("USB: oti6858 usb-serial driver (in Nokia CA-42
cable)")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'drivers/usb/serial')
| -rw-r--r-- | drivers/usb/serial/oti6858.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/usb/serial/oti6858.c b/drivers/usb/serial/oti6858.c index 7e3e0782e..ff83d87ed 100644 --- a/drivers/usb/serial/oti6858.c +++ b/drivers/usb/serial/oti6858.c @@ -135,6 +135,7 @@ static int oti6858_tiocmget(struct tty_struct *tty); static int oti6858_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear); static int oti6858_tiocmiwait(struct tty_struct *tty, unsigned long arg); +static int oti6858_attach(struct usb_serial *serial); static int oti6858_port_probe(struct usb_serial_port *port); static int oti6858_port_remove(struct usb_serial_port *port); @@ -159,6 +160,7 @@ static struct usb_serial_driver oti6858_device = { .write_bulk_callback = oti6858_write_bulk_callback, .write_room = oti6858_write_room, .chars_in_buffer = oti6858_chars_in_buffer, + .attach = oti6858_attach, .port_probe = oti6858_port_probe, .port_remove = oti6858_port_remove, }; @@ -328,6 +330,20 @@ static void send_data(struct work_struct *work) usb_serial_port_softint(port); } +static int oti6858_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 || + serial->num_interrupt_in < num_ports) { + dev_err(&serial->interface->dev, "missing endpoints\n"); + return -ENODEV; + } + + return 0; +} + static int oti6858_port_probe(struct usb_serial_port *port) { struct oti6858_private *priv; |