tree 40798b1f57f8415a5fa43e188ae1dcc8ae843e74
parent 33db4b77d58a2ae81c84278e2447ab011071a622
author Shunta Sato <Shunta.Sato@sonymobile.com> 1476264917 +0900
committer Andrii Kulian <akulian@google.com> 1480971505 -0800

Avoid NPE around mReusedTask of ActivityStarter

Symptom:
System crash by NPE is observed on ActivityStarter
during phone boot-up.

Detail and sample:
ActivityStarter has possibility to be called itself recursively
by calling TaskRecord$performClearTaskLocked().
Then class variable of mReusedTask is initialized to null
after the call, because the recursive call isn't guarded by
synchronized block.
Then NPE crash occurs on next statement.

Solutions:
Call performClearTaskLocked() before assigning 
intentActivity.task to mReusedTask.

Bug: 32361138
Test: builds, boots, Manual testing of condition in bug
Author: Shigeki Yokomichi <shigeki.x.yokomichi@sonymobile.com>
Change-Id: Iaea3e066a6f7134fcae4338ff864bb236241194c
(cherry picked from commit 0bd28e2c5f7fd7e4448ae489b425e4e5cee57f9a)