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Baolu
On 03/25/2016 10:58 AM, Lu Baolu wrote:
> From: Oliver Neukum <oneukum@xxxxxxxx>
>
> An attack has become available which pretends to be a quirky
> device circumventing normal sanity checks and crashes the kernel
> by an insufficient number of interfaces. This patch adds a check
> to the code path for quirky devices.
>
> Signed-off-by: Oliver Neukum <ONeukum@xxxxxxxx>
> CC: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> ---
> drivers/usb/class/cdc-acm.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
> index 1d2c99a..83fd30b 100644
> --- a/drivers/usb/class/cdc-acm.c
> +++ b/drivers/usb/class/cdc-acm.c
> @@ -1179,6 +1179,9 @@ static int acm_probe(struct usb_interface *intf,
> if (quirks == NO_UNION_NORMAL) {
> data_interface = usb_ifnum_to_if(usb_dev, 1);
> control_interface = usb_ifnum_to_if(usb_dev, 0);
> + /* we would crash */
> + if (!data_interface || !control_interface)
> + return -ENODEV;
> goto skip_normal_probe;
> }
>
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