usb: gadgetfs: restrict upper bound on device configuration size
authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 6 Dec 2016 07:36:29 +0000 (08:36 +0100)
committerFelipe Balbi <felipe.balbi@linux.intel.com>
Mon, 2 Jan 2017 08:55:28 +0000 (10:55 +0200)
commit0994b0a257557e18ee8f0b7c5f0f73fe2b54eec1
tree40edc31af2f6dc5a7d9ee15de153662de6a9158e
parentbcdbeb844773333d2d1c08004f3b3e25921040e5
usb: gadgetfs: restrict upper bound on device configuration size

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>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
drivers/usb/gadget/legacy/inode.c