From 1a34b465bc98e40afc7118f9f63e4f9839e5c908 Mon Sep 17 00:00:00 2001
From: Matthew Jordan <mjordan@digium.com>
Date: Thu, 28 Feb 2013 17:17:35 +0000
Subject: [PATCH] Prevent deadlock in chan_iax2 when attempting to set caller
ID
A deadlock can occur in chan_iax2 when it attempts to set the caller ID, as it
already holds the iax2 private lock and improperly fails to obtain the channel
lock before calling ast_set_callerid. By not safely obtaining the channel lock,
a locking inversion can take place, causing a deadlock.
This patch solves this by calling the required deadlock avoidance functions
that obtain the channel lock before setting the caller ID.
Thanks to Pavel for fixing my syntax errors and testing this patch out.
(closes issue ASTERISK-21128)
Reported by: Pavel Troller
Tested by: Pavel Troller
patches:
ASTERISK-21128-1.8.diff uploaded by mjordan (license 6283)
ASTERISK-21128-modified-1.8.diff uploaded by Pavel Troller (license 6302)
........
Merged revisions 382233 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........
Merged revisions 382234 from http://svn.asterisk.org/svn/asterisk/branches/11
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@382236 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
channels/chan_iax2.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/channels/chan_iax2.c b/channels/chan_iax2.c
index 5eb273f8de..5a307bf0c6 100644
--- a/channels/chan_iax2.c
+++ b/channels/chan_iax2.c
@@ -11573,13 +11573,15 @@ immediatedial:
ast_string_field_set(iaxs[fr->callno], cid_name, connected.id.name.str);
iaxs[fr->callno]->calling_pres = ast_party_id_presentation(&connected.id);
- if (iaxs[fr->callno]->owner) {
+ iax2_lock_owner(fr->callno);
+ if (iaxs[fr->callno] && iaxs[fr->callno]->owner) {
ast_set_callerid(iaxs[fr->callno]->owner,
S_COR(connected.id.number.valid, connected.id.number.str, ""),
S_COR(connected.id.name.valid, connected.id.name.str, ""),
NULL);
ast_channel_caller(iaxs[fr->callno]->owner)->id.number.presentation = connected.id.number.presentation;
ast_channel_caller(iaxs[fr->callno]->owner)->id.name.presentation = connected.id.name.presentation;
+ ast_channel_unlock(iaxs[fr->callno]->owner);
}
}
ast_party_connected_line_free(&connected);
--
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