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62b5884875
Different tools generate slightly different formats of the isight firmware. Ensure that the firmware buffer is not overrun, while still ensuring that the correct amount of data is written if trailing data is present. Signed-off-by: Matthew Garrett <mjg@redhat.com> Report-by: Justin Mattock <justinmattock@gmail.com> Tested-by: Justin Mattock <justinmattock@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
/*
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* Driver for loading USB isight firmware
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*
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* Copyright (C) 2008 Matthew Garrett <mjg@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation, version 2.
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*
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* The USB isight cameras in recent Apples are roughly compatible with the USB
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* video class specification, and can be driven by uvcvideo. However, they
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* need firmware to be loaded beforehand. After firmware loading, the device
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* detaches from the USB bus and reattaches with a new device ID. It can then
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* be claimed by the uvc driver.
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*
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* The firmware is non-free and must be extracted by the user. Tools to do this
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* are available at http://bersace03.free.fr/ift/
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*
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* The isight firmware loading was reverse engineered by Johannes Berg
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* <johannes@sipsolutions.de>, and this driver is based on code by Ronald
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* Bultje <rbultje@ronald.bitfreak.net>
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*/
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#include <linux/usb.h>
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#include <linux/firmware.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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static struct usb_device_id id_table[] = {
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{USB_DEVICE(0x05ac, 0x8300)},
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{},
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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static int isight_firmware_load(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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struct usb_device *dev = interface_to_usbdev(intf);
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int llen, len, req, ret = 0;
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const struct firmware *firmware;
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unsigned char *buf = kmalloc(50, GFP_KERNEL);
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unsigned char data[4];
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u8 *ptr;
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if (!buf)
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return -ENOMEM;
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if (request_firmware(&firmware, "isight.fw", &dev->dev) != 0) {
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printk(KERN_ERR "Unable to load isight firmware\n");
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return -ENODEV;
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}
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ptr = firmware->data;
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if (usb_control_msg
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(dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, "\1", 1,
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300) != 1) {
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printk(KERN_ERR
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"Failed to initialise isight firmware loader\n");
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ret = -ENODEV;
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goto out;
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}
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while (ptr+4 <= firmware->data+firmware->size) {
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memcpy(data, ptr, 4);
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len = (data[0] << 8 | data[1]);
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req = (data[2] << 8 | data[3]);
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ptr += 4;
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if (len == 0x8001)
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break; /* success */
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else if (len == 0)
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continue;
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for (; len > 0; req += 50) {
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llen = min(len, 50);
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len -= llen;
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if (ptr+llen > firmware->data+firmware->size) {
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printk(KERN_ERR
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"Malformed isight firmware");
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ret = -ENODEV;
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goto out;
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}
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memcpy(buf, ptr, llen);
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ptr += llen;
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if (usb_control_msg
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(dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, req, 0,
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buf, llen, 300) != llen) {
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printk(KERN_ERR
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"Failed to load isight firmware\n");
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kfree(buf);
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ret = -ENODEV;
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goto out;
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}
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}
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}
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if (usb_control_msg
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(dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, "\0", 1,
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300) != 1) {
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printk(KERN_ERR "isight firmware loading completion failed\n");
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ret = -ENODEV;
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}
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out:
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kfree(buf);
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release_firmware(firmware);
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return ret;
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}
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static void isight_firmware_disconnect(struct usb_interface *intf)
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{
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}
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static struct usb_driver isight_firmware_driver = {
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.name = "isight_firmware",
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.probe = isight_firmware_load,
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.disconnect = isight_firmware_disconnect,
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.id_table = id_table,
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};
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static int __init isight_firmware_init(void)
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{
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return usb_register(&isight_firmware_driver);
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}
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static void __exit isight_firmware_exit(void)
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{
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usb_deregister(&isight_firmware_driver);
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}
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module_init(isight_firmware_init);
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module_exit(isight_firmware_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
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