Add additional sanity checks (bug #3548)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@5016 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_h323.c b/channels/chan_h323.c
index 3756dc9..812e932 100755 (executable)
--- a/channels/chan_h323.c
+++ b/channels/chan_h323.c
@@ -366,7 +366,8 @@ static struct oh323_peer *build_peer(char *name, struct ast_variable *v)
        } else {
                ast_mutex_unlock(&peerl.lock);
                peer = (struct oh323_peer*)malloc(sizeof(struct oh323_peer));
-               memset(peer, 0, sizeof(struct oh323_peer));
+               if (peer)
+                       memset(peer, 0, sizeof(struct oh323_peer));
        }
        if (peer) {
                if (!found) {
@@ -468,7 +469,7 @@ static int oh323_digit(struct ast_channel *c, char digit)
                ast_rtp_senddigit(p->rtp, digit);
        }
        /* If in-band DTMF is desired, send that */
-       if (p->dtmfmode & H323_DTMF_INBAND) {
+       if (p && (p->dtmfmode & H323_DTMF_INBAND)) {
                h323_send_tone(p->cd.call_token, digit);
        }
        return 0;
@@ -632,9 +633,9 @@ static struct ast_frame *oh323_rtp_read(struct oh323_pvt *pvt)
                                ast_set_write_format(pvt->owner, pvt->owner->writeformat);
                        }       
                        /* Do in-band DTMF detection */
-                       if (pvt->dtmfmode & H323_DTMF_INBAND) {
+                       if ((pvt->dtmfmode & H323_DTMF_INBAND) && pvt->vad) {
                                f = ast_dsp_process(pvt->owner,pvt->vad,f);
-                               if (f->frametype == AST_FRAME_DTMF) {
+                               if (f &&(f->frametype == AST_FRAME_DTMF)) {
                                        ast_log(LOG_DEBUG, "Received in-band digit %c.\n", f->subclass);
                                }
                        }
@@ -857,11 +858,11 @@ static struct oh323_pvt *oh323_alloc(int callid)
        if ((pvt->cd).call_token == NULL) {
                (pvt->cd).call_token = (char *)malloc(128);
        }
-       memset((char *)(pvt->cd).call_token, 0, 128);
        if (!pvt->cd.call_token) {
                ast_log(LOG_ERROR, "Not enough memory to alocate call token\n");
                return NULL;
        }
+       memset((char *)(pvt->cd).call_token, 0, 128);
        pvt->cd.call_reference = callid;
        pvt->bridge = bridging; 
        pvt->dtmfmode = dtmfmode;