Fix SF security vulnerability: 32706020

Because of lack of mutex lock when get mConsumerName, if one thread
getConsumerName, another thread setConsumerName frequently, an UAF will
be triggered.

Change-Id: Id1bbf0d15de6d16def2f54ecade385058cda3b65
Test: Marling with poc provided in bug report.
Bug: 32706020
(cherry picked from commit d073eb7a)