Say I have a Rust function meant to be called from C code:

#[unsafe(no_mangle)]
extern "C" fn foo() -> *mut u8 {
  unsafe { libc::malloc(42) }
}

Can I free the return value of this function in C code with:

#include <stdlib.h>

int main(void) {
  uint8_t* x = foo();
  free(x);
  return 0;
}

Are there any dangerous assumptions being made here using free to free the return value of foo?

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