Fix recently introduced zap crash from HOLD/UNHOLD patch (bug #3365)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@4831 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_zap.c b/channels/chan_zap.c
index 36efc21764e9af856b8cae4903ffc2d88f71bac0..c32149cb613fd4a5625b29511b8c5d7d821d88da 100755 (executable)
--- a/channels/chan_zap.c
+++ b/channels/chan_zap.c
@@ -4392,12 +4392,11 @@ static int zt_indicate(struct ast_channel *chan, int condition)
                                chan->_softhangup |= AST_SOFTHANGUP_DEV;
                                res = 0;
                        } else if (!p->proceeding && p->sig==SIG_PRI && p->pri && !p->outgoing) {
-                               if (p->pri->pri) {              
+                               if (p->pri) {           
                                        if (!pri_grab(p, p->pri)) {
                                                pri_progress(p->pri->pri,p->call, PVT_TO_CHANNEL(p), 1);
                                                pri_rel(p->pri);
-                                       }
-                                       else
+                                       } else
                                                ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);
                                }
                                p->proceeding=1;
@@ -4408,10 +4407,22 @@ static int zt_indicate(struct ast_channel *chan, int condition)
                        break;
 #ifdef ZAPATA_PRI
                case AST_CONTROL_HOLD:
-                       res = pri_notify(p->pri->pri, p->call, p->prioffset, PRI_NOTIFY_REMOTE_HOLD);
+                       if (p->pri) {
+                               if (!pri_grab(p, p->pri)) {
+                                       res = pri_notify(p->pri->pri, p->call, p->prioffset, PRI_NOTIFY_REMOTE_HOLD);
+                                       pri_rel(p->pri);
+                               } else
+                                               ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);                       
+                       }
                        break;
                case AST_CONTROL_UNHOLD:
-                       res = pri_notify(p->pri->pri, p->call, p->prioffset, PRI_NOTIFY_REMOTE_RETRIEVAL);
+                       if (p->pri) {
+                               if (!pri_grab(p, p->pri)) {
+                                       res = pri_notify(p->pri->pri, p->call, p->prioffset, PRI_NOTIFY_REMOTE_RETRIEVAL);
+                                       pri_rel(p->pri);
+                               } else
+                                               ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);                       
+                       }
                        break;
 #endif
                case AST_CONTROL_RADIO_KEY: