Re: [ 88.628451] BUG: unable to handle kernel paging request atf8dbf000 "isight_firmware"

From: Greg KH
Date: Fri Jun 06 2008 - 15:05:53 EST


On Fri, Jun 06, 2008 at 06:38:57PM +0000, Justin Mattock wrote:
> On Fri, Jun 6, 2008 at 6:10 PM, Justin Mattock <justinmattock@xxxxxxxxx> wrote:
> > On Fri, Jun 6, 2008 at 6:07 PM, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> >> On Fri, 6 Jun 2008 13:11:36 +0100 Matthew Garrett <mjg59@xxxxxxxxxxxxx> wrote:
> >>
> >>> Argh. My firmware image contained the 0x8001 token that indicates end of
> >>> firmware - the ones generated by Etienne's tool don't, so the driver
> >>> reads straight off the end of the buffer. Can you try this patch? It
> >>> also incorporates the cleanups Andrew suggested, and should be resistant
> >>> to malformed data.
> >>>
> >>> diff --git a/drivers/usb/misc/isight_firmware.c b/drivers/usb/misc/isight_firmware.c
> >>> index 390e048..cc5943c 100644
> >>> --- a/drivers/usb/misc/isight_firmware.c
> >>> +++ b/drivers/usb/misc/isight_firmware.c
> >>> @@ -39,9 +39,9 @@ static int isight_firmware_load(struct usb_interface *intf,
> >>> struct usb_device *dev = interface_to_usbdev(intf);
> >>> int llen, len, req, ret = 0;
> >>> const struct firmware *firmware;
> >>> - unsigned char *buf;
> >>> + unsigned char *buf = kmalloc(50, GFP_KERNEL);
> >>> unsigned char data[4];
> >>> - char *ptr;
> >>> + u8 *ptr;
> >>
> >> if (!buf)
> >> return -ENOMEM;
> >>
> >> please.
> >>
> >>> if (request_firmware(&firmware, "isight.fw", &dev->dev) != 0) {
> >>> printk(KERN_ERR "Unable to load isight firmware\n");
> >>> @@ -59,7 +59,7 @@ static int isight_firmware_load(struct usb_interface *intf,
> >>> goto out;
> >>> }
> >>>
> >>> - while (1) {
> >>> + while (ptr+4 <= firmware->data+firmware->size) {
> >>> memcpy(data, ptr, 4);
> >>> len = (data[0] << 8 | data[1]);
> >>> req = (data[2] << 8 | data[3]);
> >>
> >>
> >
> > O.K. Thanks for the help and patch, I'll go ahead and add that in and
> > let you know.
> > regards;
> >
> > --
> > Justin P. Mattock
> >
>
> Alright applied the patch and everything seems O.K.,("now I can check
> shit in between my teeth") ;-)
> I let you know if something happens, and again thanks for the help.
> regards;

Great, thanks for testing and letting us know.

Matthew, care to send me a patch for the driver for 2.6.26-final?

thanks,

greg k-h
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