ssh_packet_enable_delayed_compress(struct ssh *ssh)
{
	struct session_state *state = ssh->state;
	struct sshcomp *comp = NULL;
	int r, mode;

	/*
	 * Remember that we are past the authentication step, so rekeying
	 * with COMP_DELAYED will turn on compression immediately.
	 */
	state->after_authentication = 1;
	for (mode = 0; mode < MODE_MAX; mode++) {
		/* protocol error: USERAUTH_SUCCESS received before NEWKEYS */
		if (state->newkeys[mode] == NULL)
			continue;
		comp = &state->newkeys[mode]->comp;
		if (comp && !comp->enabled && comp->type == COMP_DELAYED) {
			if ((r = ssh_packet_init_compression(ssh)) != 0)
				return r;
			if (mode == MODE_OUT) {
				if ((r = start_compression_out(ssh, 6)) != 0)
					return r;
			} else {
				if ((r = start_compression_in(ssh)) != 0)
					return r;
			}
			comp->enabled = 1;
		}
	}
	return 0;
}

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.