Fix memory fault during exiting and waiting for worker

srsenb/src/phy/phy.cc

@@ -174,9 +174,11 @@ void phy::rem_rnti(uint16_t rnti)
   // Remove the RNTI when the TTI finishes, this has a delay up to the pipeline length (3 ms)
   for (uint32_t i = 0; i < nof_workers; i++) {
     sf_worker* w = (sf_worker*)workers_pool.wait_worker_id(i);
+    if (w) {
       w->rem_rnti(rnti);
       w->release();
     }
+  }
   if (SRSLTE_RNTI_ISUSER(rnti)) {
     workers_common.ue_db.rem_rnti(rnti);
     workers_common.clear_grants(rnti);

srsue/src/phy/phy.cc

@@ -390,9 +390,11 @@ void phy::set_crnti(uint16_t rnti)
   // set_crnti() is an operation that takes time, apply asynrhonously with processing
   for (uint32_t i = 0; i < nof_workers; i++) {
     sf_worker* w = (sf_worker*)workers_pool.wait_worker_id(i);
+    if (w) {
       w->set_crnti(rnti);
       w->release();
     }
+  }
 }
 
 // Start GUI
@@ -429,9 +431,11 @@ void phy::set_config(srslte::phy_cfg_t& config_, uint32_t cc_idx, uint32_t earfc
       if (cell_info) {
         // set_cell() is an operation that takes time, apply asynrhonously with processing
         sf_worker* w = (sf_worker*)workers_pool.wait_worker_id(i);
+        if (w) {
           w->set_cell(cc_idx, *cell_info);
           w->release();
         }
+      }
       // set_config() is just a memcpy
       workers[i]->set_config(cc_idx, config_);
     }

srsue/src/phy/sync.cc

@@ -708,9 +708,11 @@ bool sync::set_cell(float cfo)
   bool success = true;
   for (uint32_t i = 0; i < workers_pool->get_nof_workers(); i++) {
     sf_worker* w = (sf_worker*)workers_pool->wait_worker_id(i);
+    if (w) {
       success &= w->set_cell(0, cell);
       w->release();
     }
+  }
   if (!success) {
     Error("SYNC:  Setting cell: initiating PHCH worker\n");
     return false;