- for (i = 0; i < shmp(handle, bufb->chan)->backend.num_subbuf; i++) {
- id = shmp_index(handle, bufb->buf_wsb, i)->id;
- sb_bindex = subbuffer_id_get_index(config, id);
- pages = shmp_index(handle, bufb->array, sb_bindex);
- records_unread += v_read(config, &shmp(handle, pages->shmp)->records_unread);
+ chan = shmp(handle, bufb->chan);
+ if (!chan)
+ return 0;
+ for (i = 0; i < chan->backend.num_subbuf; i++) {
+ struct lttng_ust_lib_ring_buffer_backend_subbuffer *wsb;
+ struct lttng_ust_lib_ring_buffer_backend_pages_shmp *rpages;
+ struct lttng_ust_lib_ring_buffer_backend_pages *backend_pages;
+
+ wsb = shmp_index(handle, bufb->buf_wsb, i);
+ if (!wsb)
+ return 0;
+ sb_bindex = subbuffer_id_get_index(config, wsb->id);
+ rpages = shmp_index(handle, bufb->array, sb_bindex);
+ if (!rpages)
+ return 0;
+ backend_pages = shmp(handle, rpages->shmp);
+ if (!backend_pages)
+ return 0;
+ records_unread += v_read(config, &backend_pages->records_unread);