usb: config->desc.bLength may not exceed amount of data returned by the device
authorHans de Goede <hdegoede@redhat.com>
Sat, 3 Aug 2013 14:37:48 +0000 (16:37 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 12 Aug 2013 19:24:27 +0000 (12:24 -0700)
commitb4f17a488ae2e09bfcf95c0e0b4219c246f1116a
tree08e6bf805e5066d34a9b4d5176a79bbfce1b70ce
parent3f0d1c67fa20d524fdcb4a7dcda19ed76c59be44
usb: config->desc.bLength may not exceed amount of data returned by the device

While reading the config parsing code I noticed this check is missing, without
this check config->desc.wTotalLength can end up with a value larger then the
dev->rawdescriptors length for the config, and when userspace then tries to
get the rawdescriptors bad things may happen.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/core/config.c