diff options
author | mnicholson <mnicholson@f38db490-d61c-443f-a65b-d21fe96a405b> | 2009-09-29 20:25:43 +0000 |
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committer | mnicholson <mnicholson@f38db490-d61c-443f-a65b-d21fe96a405b> | 2009-09-29 20:25:43 +0000 |
commit | 39c4d3053bb0873a0585cfe8555a4ec58971cb9e (patch) | |
tree | 5432bdfa76376543931a6f1be1ddde5e74683e33 /apps | |
parent | 9681ada0e58cf39ab4fba3854f17dedd7b5b499c (diff) |
Avoid a deadlock in chanspy, just in case the spyee is masqueraded and chanspy_ds_chan_fixup() is called with the channel locked.
(closes issue #15965)
Reported by: atis
Patches:
chanspy-deadlock-fix1.diff uploaded by mnicholson (license 96)
Tested by: atis
git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.6.0@220940 f38db490-d61c-443f-a65b-d21fe96a405b
Diffstat (limited to 'apps')
-rw-r--r-- | apps/app_chanspy.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/apps/app_chanspy.c b/apps/app_chanspy.c index 393de4254..dd69a8d3b 100644 --- a/apps/app_chanspy.c +++ b/apps/app_chanspy.c @@ -271,9 +271,10 @@ static int channel_spy(struct ast_channel *chan, struct chanspy_ds *spyee_chansp ast_channel_unlock(chan); ast_mutex_lock(&spyee_chanspy_ds->lock); - if (spyee_chanspy_ds->chan) { - spyee = spyee_chanspy_ds->chan; - ast_channel_lock(spyee); + while ((spyee = spyee_chanspy_ds->chan) && ast_channel_trylock(spyee)) { + /* avoid a deadlock here, just in case spyee is masqueraded and + * chanspy_ds_chan_fixup() is called with the channel locked */ + DEADLOCK_AVOIDANCE(&spyee_chanspy_ds->lock); } ast_mutex_unlock(&spyee_chanspy_ds->lock); |