forked from Minki/linux
0393e73564
According to the UVC specification, stream error events carry no data. Fix a buffer overflow (that should be harmless given data alignment) when reporting the stream error event by removing the data byte from the message. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
222 lines
5.1 KiB
C
222 lines
5.1 KiB
C
/*
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* uvc_status.c -- USB Video Class driver - Status endpoint
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*
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* Copyright (C) 2005-2009
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* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/input.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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#include <linux/usb/input.h>
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#include "uvcvideo.h"
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/* --------------------------------------------------------------------------
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* Input device
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*/
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#ifdef CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV
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static int uvc_input_init(struct uvc_device *dev)
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{
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struct input_dev *input;
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int ret;
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input = input_allocate_device();
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if (input == NULL)
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return -ENOMEM;
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usb_make_path(dev->udev, dev->input_phys, sizeof(dev->input_phys));
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strlcat(dev->input_phys, "/button", sizeof(dev->input_phys));
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input->name = dev->name;
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input->phys = dev->input_phys;
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usb_to_input_id(dev->udev, &input->id);
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input->dev.parent = &dev->intf->dev;
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__set_bit(EV_KEY, input->evbit);
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__set_bit(KEY_CAMERA, input->keybit);
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if ((ret = input_register_device(input)) < 0)
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goto error;
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dev->input = input;
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return 0;
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error:
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input_free_device(input);
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return ret;
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}
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static void uvc_input_cleanup(struct uvc_device *dev)
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{
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if (dev->input)
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input_unregister_device(dev->input);
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}
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static void uvc_input_report_key(struct uvc_device *dev, unsigned int code,
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int value)
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{
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if (dev->input) {
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input_report_key(dev->input, code, value);
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input_sync(dev->input);
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}
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}
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#else
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#define uvc_input_init(dev)
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#define uvc_input_cleanup(dev)
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#define uvc_input_report_key(dev, code, value)
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#endif /* CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV */
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/* --------------------------------------------------------------------------
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* Status interrupt endpoint
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*/
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static void uvc_event_streaming(struct uvc_device *dev, __u8 *data, int len)
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{
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if (len < 3) {
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uvc_trace(UVC_TRACE_STATUS, "Invalid streaming status event "
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"received.\n");
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return;
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}
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if (data[2] == 0) {
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if (len < 4)
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return;
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uvc_trace(UVC_TRACE_STATUS, "Button (intf %u) %s len %d\n",
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data[1], data[3] ? "pressed" : "released", len);
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uvc_input_report_key(dev, KEY_CAMERA, data[3]);
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} else {
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uvc_trace(UVC_TRACE_STATUS,
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"Stream %u error event %02x len %d.\n",
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data[1], data[2], len);
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}
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}
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static void uvc_event_control(struct uvc_device *dev, __u8 *data, int len)
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{
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char *attrs[3] = { "value", "info", "failure" };
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if (len < 6 || data[2] != 0 || data[4] > 2) {
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uvc_trace(UVC_TRACE_STATUS, "Invalid control status event "
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"received.\n");
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return;
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}
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uvc_trace(UVC_TRACE_STATUS, "Control %u/%u %s change len %d.\n",
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data[1], data[3], attrs[data[4]], len);
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}
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static void uvc_status_complete(struct urb *urb)
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{
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struct uvc_device *dev = urb->context;
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int len, ret;
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switch (urb->status) {
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case 0:
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break;
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case -ENOENT: /* usb_kill_urb() called. */
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case -ECONNRESET: /* usb_unlink_urb() called. */
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case -ESHUTDOWN: /* The endpoint is being disabled. */
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case -EPROTO: /* Device is disconnected (reported by some
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* host controller). */
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return;
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default:
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uvc_printk(KERN_WARNING, "Non-zero status (%d) in status "
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"completion handler.\n", urb->status);
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return;
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}
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len = urb->actual_length;
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if (len > 0) {
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switch (dev->status[0] & 0x0f) {
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case UVC_STATUS_TYPE_CONTROL:
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uvc_event_control(dev, dev->status, len);
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break;
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case UVC_STATUS_TYPE_STREAMING:
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uvc_event_streaming(dev, dev->status, len);
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break;
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default:
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uvc_trace(UVC_TRACE_STATUS, "Unknown status event "
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"type %u.\n", dev->status[0]);
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break;
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}
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}
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/* Resubmit the URB. */
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urb->interval = dev->int_ep->desc.bInterval;
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if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
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uvc_printk(KERN_ERR, "Failed to resubmit status URB (%d).\n",
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ret);
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}
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}
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int uvc_status_init(struct uvc_device *dev)
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{
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struct usb_host_endpoint *ep = dev->int_ep;
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unsigned int pipe;
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int interval;
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if (ep == NULL)
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return 0;
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uvc_input_init(dev);
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dev->status = kzalloc(UVC_MAX_STATUS_SIZE, GFP_KERNEL);
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if (dev->status == NULL)
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return -ENOMEM;
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dev->int_urb = usb_alloc_urb(0, GFP_KERNEL);
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if (dev->int_urb == NULL) {
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kfree(dev->status);
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return -ENOMEM;
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}
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pipe = usb_rcvintpipe(dev->udev, ep->desc.bEndpointAddress);
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/* For high-speed interrupt endpoints, the bInterval value is used as
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* an exponent of two. Some developers forgot about it.
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*/
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interval = ep->desc.bInterval;
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if (interval > 16 && dev->udev->speed == USB_SPEED_HIGH &&
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(dev->quirks & UVC_QUIRK_STATUS_INTERVAL))
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interval = fls(interval) - 1;
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usb_fill_int_urb(dev->int_urb, dev->udev, pipe,
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dev->status, UVC_MAX_STATUS_SIZE, uvc_status_complete,
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dev, interval);
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return 0;
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}
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void uvc_status_cleanup(struct uvc_device *dev)
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{
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usb_kill_urb(dev->int_urb);
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usb_free_urb(dev->int_urb);
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kfree(dev->status);
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uvc_input_cleanup(dev);
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}
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int uvc_status_start(struct uvc_device *dev, gfp_t flags)
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{
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if (dev->int_urb == NULL)
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return 0;
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return usb_submit_urb(dev->int_urb, flags);
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}
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void uvc_status_stop(struct uvc_device *dev)
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{
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usb_kill_urb(dev->int_urb);
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}
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