static void perf_event_mmap_output(struct perf_event *event,
				     struct perf_mmap_event *mmap_event)
{
	struct perf_output_handle handle;
	struct perf_sample_data sample;
	int size = mmap_event->event_id.header.size;
	int ret;

	perf_event_header__init_id(&mmap_event->event_id.header, &sample, event);
	ret = perf_output_begin(&handle, event,
				mmap_event->event_id.header.size);
	if (ret)
		goto out;

	mmap_event->event_id.pid = perf_event_pid(event, current);
	mmap_event->event_id.tid = perf_event_tid(event, current);

	perf_output_put(&handle, mmap_event->event_id);
	__output_copy(&handle, mmap_event->file_name,
				   mmap_event->file_size);

	perf_event__output_id_sample(event, &handle, &sample);

	perf_output_end(&handle);
out:
	mmap_event->event_id.header.size = size;
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.