case VIDIOC_G_AUDIO:
        {
                struct v4l2_audio *p=arg;
+               __u32 index=p->index;
 
                if (!vfd->vidioc_g_audio)
                        break;
+
+               memset(p,0,sizeof(*p));
+               p->index=index;
                dbgarg(cmd, "Get for index=%d\n", p->index);
                ret=vfd->vidioc_g_audio(file, fh, p);
                if (!ret)
        case VIDIOC_G_TUNER:
        {
                struct v4l2_tuner *p=arg;
+               __u32 index=p->index;
+
                if (!vfd->vidioc_g_tuner)
                        break;
+
+               memset(p,0,sizeof(*p));
+               p->index=index;
+
                ret=vfd->vidioc_g_tuner(file, fh, p);
                if (!ret)
                        dbgarg (cmd, "index=%d, name=%s, type=%d, "
                struct v4l2_frequency *p=arg;
                if (!vfd->vidioc_g_frequency)
                        break;
+
+               memset(p,0,sizeof(*p));
+
                ret=vfd->vidioc_g_frequency(file, fh, p);
                if (!ret)
                        dbgarg (cmd, "tuner=%d, type=%d, frequency=%d\n",