qcacld-3.0: Check for adapter validity in pre cac work

Check for adapter validity for pre cac adapter close work function
and hdd context validity to avoid crash during race condition in
SSR case.

Change-Id: I6c167e8f1a8199c63fba905fff4e781d244c7dc1
CRs-fixed: 2021403

core/hdd/src/wlan_hdd_hostapd.c

@@ -891,40 +891,53 @@ static int wlan_hdd_set_pre_cac_complete_status(hdd_adapter_t *ap_adapter,
 }
 
 /**
- * wlan_hdd_sap_pre_cac_failure() - Process the pre cac failure
+ * __wlan_hdd_sap_pre_cac_failure() - Process the pre cac failure
  * @data: AP adapter
  *
  * Deletes the pre cac adapter
  *
  * Return: None
  */
-void wlan_hdd_sap_pre_cac_failure(void *data)
+static void __wlan_hdd_sap_pre_cac_failure(void *data)
 {
-	hdd_adapter_t *pHostapdAdapter;
+	hdd_adapter_t *adapter;
 	hdd_context_t *hdd_ctx;
 
 	ENTER();
 
-	pHostapdAdapter = (hdd_adapter_t *) data;
-	if (!pHostapdAdapter) {
-		hdd_err("AP adapter is NULL");
+	adapter = (hdd_adapter_t *) data;
+	if (!adapter ||
+	    adapter->magic != WLAN_HDD_ADAPTER_MAGIC) {
+		hdd_err("SAP Pre CAC adapter invalid");
 		return;
 	}
 
-	hdd_ctx = (hdd_context_t *) (pHostapdAdapter->pHddCtx);
-	if (!hdd_ctx) {
+	hdd_ctx = (hdd_context_t *) (adapter->pHddCtx);
+	if (wlan_hdd_validate_context(hdd_ctx)) {
 		hdd_err("HDD context is null");
 		return;
 	}
 
-	cds_ssr_protect(__func__);
 	wlan_hdd_release_intf_addr(hdd_ctx,
-				   pHostapdAdapter->macAddressCurrent.bytes);
-	hdd_stop_adapter(hdd_ctx, pHostapdAdapter, true);
-	hdd_close_adapter(hdd_ctx, pHostapdAdapter, false);
-	cds_ssr_unprotect(__func__);
+				   adapter->macAddressCurrent.bytes);
+	hdd_stop_adapter(hdd_ctx, adapter, true);
+	hdd_close_adapter(hdd_ctx, adapter, false);
 }
 
+/**
+ * wlan_hdd_sap_pre_cac_failure() - Process the pre cac failure
+ * @data: AP adapter
+ *
+ * Deletes the pre cac adapter
+ *
+ * Return: None
+ */
+void wlan_hdd_sap_pre_cac_failure(void *data)
+{
+	cds_ssr_protect(__func__);
+	__wlan_hdd_sap_pre_cac_failure(data);
+	cds_ssr_unprotect(__func__);
+}
 
 /**
  * wlan_hdd_sap_pre_cac_success() - Process the pre cac result