From: Matthew Jordan <mjordan@digium.com>
Date: Sun, 4 Nov 2012 02:43:25 +0000 (+0000)
Subject: Only deref a reserved gateway session if we actually reserved one
X-Git-Tag: 11.1.0-rc1~9
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e4afa2c0e241e17e8bc0618bb824deff67dba480;p=thirdparty%2Fasterisk.git

Only deref a reserved gateway session if we actually reserved one

Its perfectly acceptable to have a gateway session unreserved when we go to
first allocate one.  Unreffing the reserved gateway session - when its NULL -
will result in an assertion error.

This problem was caught by the Asterisk Test Suite (once we had enough of the
debugging flags enabled)
........

Merged revisions 375797 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@375798 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---

diff --git a/res/res_fax.c b/res/res_fax.c
index 900f21f668..6141dd7a87 100644
--- a/res/res_fax.c
+++ b/res/res_fax.c
@@ -2574,7 +2574,9 @@ static int fax_gateway_start(struct fax_gateway *gateway, struct ast_fax_session
 	}
 	/* release the reference for the reserved session and replace it with
 	 * the real session */
-	ao2_ref(gateway->s, -1);
+	if (gateway->s) {
+		ao2_ref(gateway->s, -1);
+	}
 	gateway->s = s;
 	gateway->token = NULL;