add error check condition for invalid channel selection

git-svn-id: http://svn.openzap.org/svn/openzap/trunk@787 a93c3328-9c30-0410-af19-c9cd2b2d52af

diff --git a/libs/freetdm/src/zap_io.c b/libs/freetdm/src/zap_io.c
index 8e5b9381c67e979f0acc6e5d79565cceec0e8356..4b62dd31534d2dc5374a9d6909860ec642f757a1 100644 (file)
--- a/libs/freetdm/src/zap_io.c
+++ b/libs/freetdm/src/zap_io.c
@@ -1122,7 +1122,11 @@ OZ_DECLARE(zap_status_t) zap_channel_open(uint32_t span_id, uint32_t chan_id, za
                goto done;
        }
        
-       check = span->channels[chan_id];
+       if (!(check = span->channels[chan_id])) {
+               zap_log(ZAP_LOG_ERROR, "Invalid Channel %d\n", chan_id);
+               *zchan = NULL;
+               goto done;
+       }
 
        if (zap_test_flag(check, ZAP_CHANNEL_SUSPENDED) || 
                !zap_test_flag(check, ZAP_CHANNEL_READY) || (status = zap_mutex_trylock(check->mutex)) != ZAP_SUCCESS) {