From b067dfbd9dfa1b9f6b494ea671054f2cbf212ae9 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Wed, 27 Aug 2014 11:55:19 +0200
Subject: [PATCH] USB: serial: fix potential heap buffer overflow

commit 5654699fb38512bdbfc0f892ce54fce75bdc2bab upstream.

Make sure to verify the number of ports requested by subdriver to avoid
writing beyond the end of fixed-size array in interface data.

The current usb-serial implementation is limited to eight ports per
interface but failed to verify that the number of ports requested by a
subdriver (which could have been determined from device descriptors) did
not exceed this limit.

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.2: s/ddev/\&interface->dev/]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
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