diff options
| author | Johan Hovold <johan@kernel.org> | 2017-01-03 16:39:49 +0100 |
|---|---|---|
| committer | Sasha Levin <alexander.levin@verizon.com> | 2017-03-02 21:51:42 -0500 |
| commit | d6e7aa701630922fc782e207d82e3caf0a2a9ea3 (patch) | |
| tree | 57b4dbe81baaa64d3b2e84d6914cfd6d0d9e9718 /drivers/usb/serial/kobil_sct.c | |
| parent | 77c5492b11f6c0f075c3f09e3a10874a4de3e5db (diff) | |
USB: serial: kobil_sct: fix NULL-deref in write
[ Upstream commit 21ce57840243c7b70fbc1ebd3dceeb70bb6e9e09 ]
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: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Diffstat (limited to 'drivers/usb/serial/kobil_sct.c')
| -rw-r--r-- | drivers/usb/serial/kobil_sct.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/usb/serial/kobil_sct.c b/drivers/usb/serial/kobil_sct.c index 2363654cafc9..813035f51fe7 100644 --- a/drivers/usb/serial/kobil_sct.c +++ b/drivers/usb/serial/kobil_sct.c @@ -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; |