asan_validate_addr
ret = asan_validate_addr(false, &blob->mem[0]);
ret = asan_validate_addr(false, &blob->mem[47]);
ret = asan_validate_addr(true, &blob->oob);
ret = asan_validate_addr(false, &mem[i]);
ret = asan_validate_addr(true, &mem[alloc_size]);
ret = asan_validate_addr(freed, &mem[i]);