Merge "diag: dci: Validate dci client entries prior to access"

/* Copyright (c) 2012-2016, The Linux Foundation. All rights reserved.

/* Copyright (c) 2012-2017, 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

{

	struct list_head *start, *temp;

	struct diag_dci_client_tbl *entry = NULL;

	struct pid *pid_struct = NULL;

	struct task_struct *task_s = NULL;

	list_for_each_safe(start, temp, &driver->dci_client_list) {

		entry = list_entry(start, struct diag_dci_client_tbl, track);

		pid_struct = find_get_pid(entry->tgid);

		if (!pid_struct) {

			DIAG_LOG(DIAG_DEBUG_DCI,

				"diag: valid pid doesn't exist for pid = %d\n",

				entry->tgid);

			continue;

		}

		task_s = get_pid_task(pid_struct, PIDTYPE_PID);

		if (!task_s) {

			DIAG_LOG(DIAG_DEBUG_DCI,

				"diag: valid task doesn't exist for pid = %d\n",

				entry->tgid);

			continue;

		}

		if (task_s == entry->client)

			if (entry->client->tgid == tgid)

				return entry;

	}