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In case, userland writes an empty string to a bool debugfs file, buf[] will still be uninitialized when being passed to strtobool() making the outcome of that function purely random. Fix this by always zero-terminating the buffer. Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>