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USB: idmouse: fix interface sanity checks 

commit 59920635b8 upstream.

Make sure to use the current alternate setting when verifying the
interface descriptors to avoid binding to an invalid interface.

Failing to do so 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: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20191210112601.3561-4-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Johan Hovold 2019-12-10 12:26:00 +01:00 committed by Greg Kroah-Hartman
parent 836924c2da
commit 6805e00788
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/misc/idmouse.c
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@ -337,7 +337,7 @@ static int idmouse_probe(struct usb_interface *interface,
int result;
/* check if we have gotten the data or the hid interface */
iface_desc = &interface->altsetting[0];
iface_desc = interface->cur_altsetting;
if (iface_desc->desc.bInterfaceClass != 0x0A)
return -ENODEV;