Fix potential seg (Bug #2550)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3857 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_iax2.c b/channels/chan_iax2.c
index e8b5628..a9beeeb 100755 (executable)
--- a/channels/chan_iax2.c
+++ b/channels/chan_iax2.c
@@ -2628,8 +2628,10 @@ tackygoto:
                cs[1] = cs[2];
        }
        lock_both(callno0, callno1);
-       iaxs[callno0]->bridgecallno = 0;
-       iaxs[callno1]->bridgecallno = 0;
+       if(iaxs[callno0])
+               iaxs[callno0]->bridgecallno = 0;
+       if(iaxs[callno1])
+               iaxs[callno1]->bridgecallno = 0;
        unlock_both(callno0, callno1);
        return res;
 }