Prevent chanspy from binding to zombie channels

This patch addresses a bug with chanspy on local channels which roughly 50% of the time
would create a situation where chanspy can latch onto a zombie channel, keeping the zombie
alive forever and causing the channel doing the spying to never be able to hang up.

(closes issue ASTERISK-19493)
Reported by: lvl
Review: https://reviewboard.asterisk.org/r/1819/
........

Merged revisions 359892 from http://svn.asterisk.org/svn/asterisk/branches/1.8

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@359898 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/apps/app_chanspy.c b/apps/app_chanspy.c
index 46529007791aa20788a358d11ba650f49f694bfa..870c423689befa9eee5eb9bd9816c0304fbf1769 100644 (file)
--- a/apps/app_chanspy.c
+++ b/apps/app_chanspy.c
@@ -529,7 +529,8 @@ static int channel_spy(struct ast_channel *chan, struct ast_autochan *spyee_auto
 
        /* We now hold the channel lock on spyee */
 
-       if (ast_check_hangup(chan) || ast_check_hangup(spyee_autochan->chan)) {
+       if (ast_check_hangup(chan) || ast_check_hangup(spyee_autochan->chan) ||
+                       ast_test_flag(spyee_autochan->chan, AST_FLAG_ZOMBIE)) {
                return 0;
        }