commit fec2c6d7eb58574b32eaa26222d3fb903b738cfa
author Joachim Bauch <jbauch@webrtc.org> Wed May 27 21:41:43 2015
committer Joachim Bauch <jbauch@webrtc.org> Wed May 27 21:41:52 2015
tree 57b52ddd8804e8d2dca26fff5c5813886bc19b75
parent 10602605f8bf73e483742e10666bbc14edc09831

Prevent potential double-free if srtp_create fails.

If srtp_create fails while adding streams, it deallocates the session
but doesn't clear the passed pointer which then could lead to a
double-free in the SrtpSession dtor.

The CL also adds locking for libsrtp initialization / shutdown.

BUG=4042
R=jiayl@webrtc.org, juberti@google.com, pthatcher@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/47319004

Cr-Commit-Position: refs/heads/master@{#9300}