Returning a pointer on stack

Yes, in Golang it is fine to return a pointer to a local variable. Golang will manage the objects lifetime for you and free it when all pointers to it are gone.

In another answer I point out all the differences between C/C++ pointers and Golang pointers: What is the meaning of '*' and '&' in Golang?

Yes, this is safe and a normal pattern in Go programming. Go uses escape analysis to move any values with pointers that escape the stack to the heap automatically. You don't need to be concerned with where values are allocated.

From the Go FAQ: "How do I know whether a variable is allocated on the heap or the stack?"

if the compiler cannot prove that the variable is not referenced after the function returns, then the compiler must allocate the variable on the garbage-collected heap to avoid dangling pointer errors

You can see these optimization choices during compilation by using the -gcflags -m option.