linux-kernel - Re: [ 88.628451] BUG: unable to handle kernel paging request at f8dbf000 "isight

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Date:	Fri, 6 Jun 2008 11:55:48 -0700
From:	Greg KH <greg@...ah.com>
To:	Justin Mattock <justinmattock@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-usb@...r.kernel.org
Subject: Re: [ 88.628451] BUG: unable to handle kernel paging request at
	f8dbf000 "isight_firmware"

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@...il.com> wrote:
> > On Fri, Jun 6, 2008 at 6:07 PM, Andrew Morton <akpm@...ux-foundation.org> wrote:
> >> On Fri, 6 Jun 2008 13:11:36 +0100 Matthew Garrett <mjg59@...f.ucam.org> 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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