evutil_weakrand_range_(struct evutil_weakrand_state *state, ev_int32_t top)
{
	ev_int32_t divisor, result;

	/* We can't just do weakrand() % top, since the low bits of the LCG
	 * are less random than the high ones.  (Specifically, since the LCG
	 * modulus is 2^N, every 2^m for m<N will divide the modulus, and so
	 * therefore the low m bits of the LCG will have period 2^m.) */
	divisor = EVUTIL_WEAKRAND_MAX / top;
	do {
		result = evutil_weakrand_(state) / divisor;
	} while (result >= top);
	return result;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.