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The function simple_strtoul() performs no error checking in scenarios where the input value overflows the intended output variable. We can replace the use of simple_strtoul() with the safer alternative kstrtoul(). This also allows us to print an error message in case of failure. Signed-off-by: Hongbo Li <[email protected]> Reviewed-by: Geert Uytterhoeven <[email protected]> Reviewed-by: John Paul Adrian Glaubitz <[email protected]> Signed-off-by: John Paul Adrian Glaubitz <[email protected]>