Re: [PATCH v4 4/6] kfuzztest: add KFuzzTest sample fuzz targets

[Alexander Potapenko]

> +#include <linux/kfuzztest.h>
> +
> +static void underflow_on_buffer(char *buf, size_t buflen)
> +{
> +       size_t i;
> +

If buflen is 0, buf is a ZERO_SIZE_PTR.
I think we should allow passing such pointers to test functions, but
each test should then correctly bail out on empty data.