From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Tue, 6 Dec 2016 07:36:29 +0000 (+0100)
Subject: usb: gadgetfs: restrict upper bound on device configuration size
X-Git-Tag: v3.2.87~142
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=510c84bdb87fa39b163317be8f3725a10c5aa186;p=pandora-kernel.git

usb: gadgetfs: restrict upper bound on device configuration size

commit 0994b0a257557e18ee8f0b7c5f0f73fe2b54eec1 upstream.

Andrey Konovalov reported that we were not properly checking the upper
limit before of a device configuration size before calling
memdup_user(), which could cause some problems.

So set the upper limit to PAGE_SIZE * 4, which should be good enough for
all devices.

Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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