[Asterisk-code-review] Bridging: Use a ref to bridge_channel's channel to prevent crash. (asterisk[13])

[Benjamin Keith Ford]

Hello Friendly Automation, 

I'd like you to reexamine a change. Please visit

    https://gerrit.asterisk.org/c/asterisk/+/14885

to look at the new patch set (#2).

Change subject: Bridging: Use a ref to bridge_channel's channel to prevent crash.
......................................................................

Bridging: Use a ref to bridge_channel's channel to prevent crash.

There's a race condition with bridging where a bridge can be torn down
causing the bridge_channel's ast_channel to become NULL when it's still
needed. This particular case happened with attended transfers, but the
crash occurred when trying to publish a stasis message. Now, the
bridge_channel is locked, a ref to the ast_channel is obtained, and that
ref is passed down the chain.

Change-Id: Ic48715c0c041615d17d286790ae3e8c61bb28814
---
M include/asterisk/bridge_channel.h
M main/bridge.c
M main/bridge_channel.c
3 files changed, 42 insertions(+), 3 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/85/14885/2
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Gerrit-Project: asterisk
Gerrit-Branch: 13
Gerrit-Change-Id: Ic48715c0c041615d17d286790ae3e8c61bb28814
Gerrit-Change-Number: 14885
Gerrit-PatchSet: 2
Gerrit-Owner: Benjamin Keith Ford <bford at digium.com>
Gerrit-Reviewer: Friendly Automation
Gerrit-MessageType: newpatchset
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