Утечка памяти в jni либе

/* 
 * Class:     ru_work_jomb_DFFChannel 
 * Method:    CiWrite 
 * Signature: (I[Lru/work/can/CANFrame;II)V 
 */ 
JNIEXPORT jint JNICALL Java_ru_work_jomb_DFFChannel_CiWrite(JNIEnv *env, jclass cl, jint chan, jobjectArray buf, jint off, jint len) { 
 
   if (len <= 0) { 
      return 0; 
   } 
    
   jclass frame_class = env->GetObjectClass(env->GetObjectArrayElement(buf, off)); 
   jfieldID fid_frame_id = env->GetFieldID(frame_class, "id", "I"); 
   jfieldID fid_frame_extendedID = env->GetFieldID(frame_class, "extendedID", "Z"); 
   jfieldID fid_frame_rtr = env->GetFieldID(frame_class, "rtr", "Z"); 
   jfieldID fid_frame_length = env->GetFieldID(frame_class, "length", "I"); 
   jfieldID fid_frame_data = env->GetFieldID(frame_class, "data", "[B"); 
 
   canmsg_t *cmbuf = new canmsg_t[len]; 
    
   for (jsize i = 0; i < len; i++) { 
      jobject frame = env->GetObjectArrayElement(buf, off + i); 
      jint id = env->GetIntField(frame, fid_frame_id); 
      jboolean extendedID = env->GetBooleanField(frame, fid_frame_extendedID); 
      jboolean rtr = env->GetBooleanField(frame, fid_frame_rtr); 
      jint length = env->GetIntField(frame, fid_frame_length); 
      jbyteArray data = (jbyteArray)env->GetObjectField(frame, fid_frame_data); 
       
      canmsg_t *cm = (cmbuf + i); 
      msg_zero(cm); 
      cm->id = (_u32)id; 
      if (extendedID) { 
         msg_seteff(cm); 
      } 
      if (rtr) { 
         msg_setrtr(cm); 
      } 
      cm->len = (_u8)length; 
      env->GetByteArrayRegion(data, 0, length, (jbyte*)cm->data); 
      env->DeleteLocalRef(data); 
      env->DeleteLocalRef(frame); 
   } 
   _s16 errCode = CiWrite((_u8)chan, cmbuf, (_s16)len); 
   delete cmbuf; 
   env->DeleteLocalRef(frame_class); 
 
 
   if (errCode < 0) { 
      ThrowDFFException(env, cl, errCode); 
      return errCode; 
   } 
 
   jint count = errCode; 
   return count; 
}