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authorJohan Hovold <johan@kernel.org>2017-01-03 16:40:02 +0100
committerJohan Hovold <johan@kernel.org>2017-01-04 10:43:57 +0100
commitcc0909248258f679c4bb4cd315565d40abaf6bc6 (patch)
tree57faa1bd5e322b6d7f50d1ccbb1dd1671643f13e /drivers/usb/serial/spcp8x5.c
parentf09d1886a41e9063b43da493ef0e845ac8afd2fa (diff)
downloadlinux-cc0909248258f679c4bb4cd315565d40abaf6bc6.tar.bz2
USB: serial: spcp8x5: fix NULL-deref at open
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 spcp8x5_open+0x30/0xd0 [spcp8x5] Fixes: 619a6f1d1423 ("USB: add usb-serial spcp8x5 driver") Cc: stable <stable@vger.kernel.org> Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'drivers/usb/serial/spcp8x5.c')
-rw-r--r--drivers/usb/serial/spcp8x5.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/usb/serial/spcp8x5.c b/drivers/usb/serial/spcp8x5.c
index ef0dbf0703c5..475e6c31b266 100644
--- a/drivers/usb/serial/spcp8x5.c
+++ b/drivers/usb/serial/spcp8x5.c
@@ -154,6 +154,19 @@ static int spcp8x5_probe(struct usb_serial *serial,
return 0;
}
+static int spcp8x5_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) {
+ dev_err(&serial->interface->dev, "missing endpoints\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
static int spcp8x5_port_probe(struct usb_serial_port *port)
{
const struct usb_device_id *id = usb_get_serial_data(port->serial);
@@ -477,6 +490,7 @@ static struct usb_serial_driver spcp8x5_device = {
.tiocmget = spcp8x5_tiocmget,
.tiocmset = spcp8x5_tiocmset,
.probe = spcp8x5_probe,
+ .attach = spcp8x5_attach,
.port_probe = spcp8x5_port_probe,
.port_remove = spcp8x5_port_remove,
};