Fix chanzap for p0, p1, etc

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@1808 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_zap.c b/channels/chan_zap.c
index a61e9af..d9ff157 100755 (executable)
--- a/channels/chan_zap.c
+++ b/channels/chan_zap.c
@@ -2226,13 +2226,19 @@ static int zt_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags,
        /* if need DTMF, cant native bridge */
        if (flags & (AST_BRIDGE_DTMF_CHANNEL_0 | AST_BRIDGE_DTMF_CHANNEL_1))
                return -2;
-       p0 = c0->pvt->pvt;
-       p1 = c1->pvt->pvt;
-       /* cant do pseudo-channels here */
-       if ((!p0->sig) || (!p1->sig)) return -2;
                
        ast_mutex_lock(&c0->lock);
        ast_mutex_lock(&c1->lock);
+
+       p0 = c0->pvt->pvt;
+       p1 = c1->pvt->pvt;
+       /* cant do pseudo-channels here */
+       if (!p0 || (!p0->sig) || !p1 || (!p1->sig)) {
+               ast_mutex_unlock(&c0->lock);
+               ast_mutex_unlock(&c1->lock);
+               return -2;
+       }
+
        op0 = p0 = c0->pvt->pvt;
        op1 = p1 = c1->pvt->pvt;
        ofd1 = c0->fds[0];