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When attempting to read data that is not actually an array of values, the length may be negative which causes an Oops due to a likely access off the end of the data array. This bug should not occur under normal use unless the device returns an invalid response. Signed-off-by: Simon Arlott <simon@fire.lp0.eu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>