Fix crash when retrieving descriptors.

If more than one descriptor is found the task would be released beofore the process completed causing a race condition.

Author: h2zero

src/NimBLERemoteCharacteristic.cpp

@@ -72,14 +72,8 @@ int NimBLERemoteCharacteristic::descriptorDiscCB(
     const auto        pChr       = (NimBLERemoteCharacteristic*)pTaskData->m_pInstance;
     const NimBLEUUID* uuidFilter = filter->uuid;
 
-    if (error->status == BLE_HS_ENOTCONN) {
-        NIMBLE_LOGE(LOG_TAG, "<< Descriptor Discovery; Not connected");
-        NimBLEUtils::taskRelease(*pTaskData, error->status);
-        return error->status;
-    }
-
     if (pChr->getHandle() != chr_val_handle) {
-        rc = BLE_HS_EDONE; // descriptor not for this characteristic
+        return 0; // Descriptor not for this characteristic
     }
 
     if (rc == 0) {
@@ -92,6 +86,7 @@ int NimBLERemoteCharacteristic::descriptorDiscCB(
         }
 
         pChr->m_vDescriptors.push_back(new NimBLERemoteDescriptor(pChr, dsc));
+        return 0;
     }
 
     NimBLEUtils::taskRelease(*pTaskData, rc);

src/NimBLERemoteService.cpp

@@ -147,7 +147,10 @@ int NimBLERemoteService::characteristicDiscCB(uint16_t              conn_handle,
                                               const ble_gatt_error* error,
                                               const ble_gatt_chr*   chr,
                                               void*                 arg) {
-    NIMBLE_LOGD(LOG_TAG, "Characteristic Discovery >>");
+    NIMBLE_LOGD(LOG_TAG,
+                "Characteristic Discovery >> status: %d handle: %d",
+                error->status,
+                (error->status == 0) ? chr->def_handle : -1);
     auto       pTaskData = (NimBLETaskData*)arg;
     const auto pSvc      = (NimBLERemoteService*)pTaskData->m_pInstance;