Re: [PATCH v3] USB: hso: Fix OOB memory access in hso_probe/hso_get_config_data

From: Greg KH <gregkh@linuxfoundation.org>
Date: Wed, 12 Dec 2018 12:42:24 +0100

From: Hui Peng <redacted>

The function hso_probe reads if_num from the USB device (as an u8) and uses
it without a length check to index an array, resulting in an OOB memory read
in hso_probe or hso_get_config_data.

Add a length check for both locations and updated hso_probe to bail on
error.

This issue has been assigned CVE-2018-19985.

Reported-by: Hui Peng <redacted>
Reported-by: Mathias Payer <redacted>
Signed-off-by: Hui Peng <redacted>
Signed-off-by: Mathias Payer <redacted>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Applied and queued up for -stable, thanks Greg.