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

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Date:	Fri, 6 Jun 2008 18:10:55 +0000
From:	"Justin Mattock" <justinmattock@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"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 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
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