ethernetif: fix potential memory leak

1. If L2_TO_L3_RX_BUF_MODE is not selected, we must assign l2_owner explictly before we call pbuf_free.
2. free intr resource in esp_eth_deinit

Closes https://github.com/espressif/esp-idf/issues/2670

components/ethernet/emac_main.c

@@ -73,6 +73,7 @@ static uint8_t emac_sig_cnt[EMAC_SIG_MAX] = {0};
 static TimerHandle_t emac_timer = NULL;
 static SemaphoreHandle_t emac_rx_xMutex = NULL;
 static SemaphoreHandle_t emac_tx_xMutex = NULL;
+static intr_handle_t eth_intr_handle = NULL;
 static const char *TAG = "emac";
 static bool pause_send = false;
 #ifdef CONFIG_PM_ENABLE
@@ -1168,7 +1169,7 @@ esp_err_t esp_eth_init_internal(eth_config_t *config)
                 EMAC_TASK_PRIORITY,
                 &emac_task_hdl);
 
-    esp_intr_alloc(ETS_ETH_MAC_INTR_SOURCE, 0, emac_process_intr, NULL, NULL);
+    esp_intr_alloc(ETS_ETH_MAC_INTR_SOURCE, 0, emac_process_intr, NULL, &eth_intr_handle);
 
     emac_config.emac_status = EMAC_RUNTIME_INIT;
 
@@ -1211,6 +1212,7 @@ esp_err_t esp_eth_deinit(void)
         free(emac_dma_tx_buf[i]);
         emac_dma_tx_buf[i] = NULL;
     }
+    esp_intr_free(eth_intr_handle);
     ret = ESP_OK;
 _exit:
     return ret;

components/ethernet/test/test_emac_deinit.c

@@ -7,17 +7,19 @@
  * @author morris
  * @date 2018-08-24
  */
+#include <stdio.h>
 #include <string.h>
-#include "unity.h"
+
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
-
+#include "freertos/event_groups.h"
 #include "esp_system.h"
 #include "esp_err.h"
 #include "esp_event_loop.h"
 #include "esp_event.h"
 #include "esp_log.h"
 #include "esp_eth.h"
+#include "unity.h"
 
 #include "rom/gpio.h"
 
@@ -37,6 +39,9 @@ static const char *TAG = "eth_test_deinit";
 #define CONFIG_PHY_ADDRESS 31
 #define CONFIG_PHY_CLOCK_MODE 0
 
+static EventGroupHandle_t eth_event_group = NULL;
+static const int GOTIP_BIT = BIT0;
+
 static void phy_device_power_enable_via_gpio(bool enable)
 {
     if (!enable) {
@@ -67,6 +72,47 @@ static void eth_gpio_config_rmii(void)
     phy_rmii_smi_configure_pins(PIN_SMI_MDC, PIN_SMI_MDIO);
 }
 
+static esp_err_t eth_event_handler(void *ctx, system_event_t *event)
+{
+    tcpip_adapter_ip_info_t ip;
+
+    switch (event->event_id) {
+    case SYSTEM_EVENT_ETH_CONNECTED:
+        ESP_LOGI(TAG, "Ethernet Link Up");
+        break;
+    case SYSTEM_EVENT_ETH_DISCONNECTED:
+        ESP_LOGI(TAG, "Ethernet Link Down");
+        break;
+    case SYSTEM_EVENT_ETH_START:
+        ESP_LOGI(TAG, "Ethernet Started");
+        break;
+    case SYSTEM_EVENT_ETH_GOT_IP:
+        memset(&ip, 0, sizeof(tcpip_adapter_ip_info_t));
+        ESP_ERROR_CHECK(tcpip_adapter_get_ip_info(ESP_IF_ETH, &ip));
+        ESP_LOGI(TAG, "Ethernet Got IP Addr");
+        ESP_LOGI(TAG, "~~~~~~~~~~~");
+        ESP_LOGI(TAG, "ETHIP:" IPSTR, IP2STR(&ip.ip));
+        ESP_LOGI(TAG, "ETHMASK:" IPSTR, IP2STR(&ip.netmask));
+        ESP_LOGI(TAG, "ETHGW:" IPSTR, IP2STR(&ip.gw));
+        ESP_LOGI(TAG, "~~~~~~~~~~~");
+        xEventGroupSetBits(eth_event_group, GOTIP_BIT);
+        break;
+    case SYSTEM_EVENT_ETH_STOP:
+        ESP_LOGI(TAG, "Ethernet Stopped");
+        break;
+    default:
+        break;
+    }
+    return ESP_OK;
+}
+
+TEST_CASE("start event loop", "[ethernet][ignore]")
+{
+    eth_event_group = xEventGroupCreate();
+    tcpip_adapter_init();
+    ESP_ERROR_CHECK(esp_event_loop_init(eth_event_handler, NULL));
+}
+
 TEST_CASE("test emac deinit", "[ethernet][ignore]")
 {
     eth_config_t config = DEFAULT_ETHERNET_PHY_CONFIG;
@@ -79,7 +125,8 @@ TEST_CASE("test emac deinit", "[ethernet][ignore]")
     ESP_ERROR_CHECK(esp_eth_init(&config));
     ESP_ERROR_CHECK(esp_eth_enable());
 
-    vTaskDelay(2000 / portTICK_RATE_MS);
+    xEventGroupWaitBits(eth_event_group, GOTIP_BIT, true, true, portMAX_DELAY);
+    vTaskDelay(15000 / portTICK_RATE_MS);
 
     ESP_ERROR_CHECK(esp_eth_disable());
     ESP_ERROR_CHECK(esp_eth_deinit());

components/lwip/port/esp32/netif/ethernetif.c

@@ -196,7 +196,6 @@ if (netif->input(p, netif) != ERR_OK) {
   /* full packet send to tcpip_thread to process */
 if (netif->input(p, netif) != ERR_OK) {
   LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
-  p->l2_owner = NULL;
   pbuf_free(p);
 }
 #endif