From: Johan Hovold johan@kernel.org
commit 6b32391ed675827f8425a414abbc6fbd54ea54fe upstream.
Make sure to use the current alternate setting when verifying the interface descriptors to avoid binding to an invalid interface.
This in turn could cause the driver to misbehave or trigger a WARN() in usb_submit_urb() that kernels with panic_on_warn set would choke on.
Fixes: bdb5c57f209c ("Input: add sur40 driver for Samsung SUR40 (aka MS Surface 2.0/Pixelsense)") Signed-off-by: Johan Hovold johan@kernel.org Acked-by: Vladis Dronov vdronov@redhat.com Link: https://lore.kernel.org/r/20191210113737.4016-8-johan@kernel.org Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/input/touchscreen/sur40.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/input/touchscreen/sur40.c +++ b/drivers/input/touchscreen/sur40.c @@ -537,7 +537,7 @@ static int sur40_probe(struct usb_interf int error;
/* Check if we really have the right interface. */ - iface_desc = &interface->altsetting[0]; + iface_desc = interface->cur_altsetting; if (iface_desc->desc.bInterfaceClass != 0xFF) return -ENODEV;