Merge "msm: sde: check buffer size before writing to user buffer"

/* Copyright (c) 2015-2017, The Linux Foundation. All rights reserved.

/* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

	if (__sde_rot_evtlog_dump_calc_range()) {

		len = sde_rot_evtlog_dump_entry(evtlog_buf,

				SDE_ROT_EVTLOG_BUF_MAX);

		if (len < 0 || len > count) {

			pr_err("len is more than the user buffer size\n");

			return 0;

		}

		if (copy_to_user(buff, evtlog_buf, len))

			return -EFAULT;

		*ppos += len;