diff options
Diffstat (limited to 'drivers/media/usb/usbvision/usbvision-video.c')
| -rw-r--r-- | drivers/media/usb/usbvision/usbvision-video.c | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/drivers/media/usb/usbvision/usbvision-video.c b/drivers/media/usb/usbvision/usbvision-video.c index b693206f66dd..de9ff3bb8edd 100644 --- a/drivers/media/usb/usbvision/usbvision-video.c +++ b/drivers/media/usb/usbvision/usbvision-video.c @@ -59,7 +59,7 @@ #include <linux/videodev2.h> #include <linux/i2c.h> -#include <media/saa7115.h> +#include <media/i2c/saa7115.h> #include <media/v4l2-common.h> #include <media/v4l2-ioctl.h> #include <media/v4l2-event.h> @@ -1461,11 +1461,32 @@ static int usbvision_probe(struct usb_interface *intf, printk(KERN_INFO "%s: %s found\n", __func__, usbvision_device_data[model].model_string); + /* + * this is a security check. + * an exploit using an incorrect bInterfaceNumber is known + */ + if (ifnum >= USB_MAXINTERFACES || !dev->actconfig->interface[ifnum]) + return -ENODEV; + if (usbvision_device_data[model].interface >= 0) interface = &dev->actconfig->interface[usbvision_device_data[model].interface]->altsetting[0]; - else + else if (ifnum < dev->actconfig->desc.bNumInterfaces) interface = &dev->actconfig->interface[ifnum]->altsetting[0]; + else { + dev_err(&intf->dev, "interface %d is invalid, max is %d\n", + ifnum, dev->actconfig->desc.bNumInterfaces - 1); + ret = -ENODEV; + goto err_usb; + } + + if (interface->desc.bNumEndpoints < 2) { + dev_err(&intf->dev, "interface %d has %d endpoints, but must" + " have minimum 2\n", ifnum, interface->desc.bNumEndpoints); + ret = -ENODEV; + goto err_usb; + } endpoint = &interface->endpoint[1].desc; + if (!usb_endpoint_xfer_isoc(endpoint)) { dev_err(&intf->dev, "%s: interface %d. has non-ISO endpoint!\n", __func__, ifnum); |