These lines in unsafe fn do_resolve convert a &mut [u8; _] to a &mut SYMBOL_INFOW:

The SYMBOL_INFOW type has inter-field padding, which means that this &mut SYMBOL_INFOW could be used to write uninit bytes which would be exposed by the underlying [u8; _].

Note that the &mut SYMBOL_INFOW is passed to an external function:

sym_from_addr is an argument to this function:

Any call to do_resolve which passes a sym_from_addr argument which writes to these padding locations would cause undefined behavior.

I would recommend modifying SYMBOL_INFOW with explicit padding fields to mitigate this problem.