[PATCH] Input: gtco: fix crash on detecting device without endpoints

[PATCH] Input: gtco: fix crash on detecting device without endpoints

[Vladis Dronov]

The gtco driver expects at least one valid endpoint. If given
malicious descriptors that specify 0 for the number of endpoints,
it will crash in the probe function. Ensure there is at least
one endpoint on the interface before using it. Fix minor coding
style issue.

The full report of this issue can be found here:
http://seclists.org/bugtraq/2016/Mar/86

Reported-by: Ralf Spenneberg <ralf@spenneberg.net>
Signed-off-by: Vladis Dronov <vdronov@redhat.com>
---
 drivers/input/tablet/gtco.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/input/tablet/gtco.c b/drivers/input/tablet/gtco.c
index 3a7f3a4..7c18249 100644
--- a/drivers/input/tablet/gtco.c
+++ b/drivers/input/tablet/gtco.c
@@ -858,6 +858,14 @@ static int gtco_probe(struct usb_interface *usbinterface,
 		goto err_free_buf;
 	}
 
+	/* Sanity check that a device has an endpoint */
+	if (usbinterface->altsetting[0].desc.bNumEndpoints < 1) {
+		dev_err(&usbinterface->dev,
+			"Invalid number of endpoints\n");
+		error = -EINVAL;
+		goto err_free_urb;
+	}
+
 	/*
 	 * The endpoint is always altsetting 0, we know this since we know
 	 * this device only has one interrupt endpoint
@@ -879,7 +887,7 @@ static int gtco_probe(struct usb_interface *usbinterface,
 	 * HID report descriptor
 	 */
 	if (usb_get_extra_descriptor(usbinterface->cur_altsetting,
-				     HID_DEVICE_TYPE, &hid_desc) != 0){
+				     HID_DEVICE_TYPE, &hid_desc) != 0) {
 		dev_err(&usbinterface->dev,
 			"Can't retrieve exta USB descriptor to get hid report descriptor length\n");
 		error = -EIO;
-- 
2.5.0

Re: [PATCH] Input: gtco: fix crash on detecting device without endpoints

[Vladis Dronov]

>> The full report of this issue can be found here:
>> http://seclists.org/bugtraq/2016/Mar/86

The subject and the body of the above message are not matching and
the message does not describe the gtco driver bug.

The full correct report of this issue can be found in the public
Red Hat Bugzilla:

https://bugzilla.redhat.com/show_bug.cgi?id=1283385

Best regards,
Vladis Dronov | Red Hat, Inc. | Product Security Engineer
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Re: [PATCH] Input: gtco: fix crash on detecting device without endpoints

[Dmitry Torokhov]

On Fri, Mar 18, 2016 at 07:35:00PM +0100, Vladis Dronov wrote:
> The gtco driver expects at least one valid endpoint. If given
> malicious descriptors that specify 0 for the number of endpoints,
> it will crash in the probe function. Ensure there is at least
> one endpoint on the interface before using it. Fix minor coding
> style issue.
> 
> The full report of this issue can be found here:
> http://seclists.org/bugtraq/2016/Mar/86
> 
> Reported-by: Ralf Spenneberg <ralf-bSzMNvQHHtybz89kn3q7ow@public.gmane.org>
> Signed-off-by: Vladis Dronov <vdronov-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Applied, thank you.

> ---
>  drivers/input/tablet/gtco.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/input/tablet/gtco.c b/drivers/input/tablet/gtco.c
> index 3a7f3a4..7c18249 100644
> --- a/drivers/input/tablet/gtco.c
> +++ b/drivers/input/tablet/gtco.c
> @@ -858,6 +858,14 @@ static int gtco_probe(struct usb_interface *usbinterface,
>  		goto err_free_buf;
>  	}
>  
> +	/* Sanity check that a device has an endpoint */
> +	if (usbinterface->altsetting[0].desc.bNumEndpoints < 1) {
> +		dev_err(&usbinterface->dev,
> +			"Invalid number of endpoints\n");
> +		error = -EINVAL;
> +		goto err_free_urb;
> +	}
> +
>  	/*
>  	 * The endpoint is always altsetting 0, we know this since we know
>  	 * this device only has one interrupt endpoint
> @@ -879,7 +887,7 @@ static int gtco_probe(struct usb_interface *usbinterface,
>  	 * HID report descriptor
>  	 */
>  	if (usb_get_extra_descriptor(usbinterface->cur_altsetting,
> -				     HID_DEVICE_TYPE, &hid_desc) != 0){
> +				     HID_DEVICE_TYPE, &hid_desc) != 0) {
>  		dev_err(&usbinterface->dev,
>  			"Can't retrieve exta USB descriptor to get hid report descriptor length\n");
>  		error = -EIO;
> -- 
> 2.5.0

-- 
Dmitry
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