From a557746cddb5cb30bae9017e827a7dc3def96cbc Mon Sep 17 00:00:00 2001
From: wangcheng <wangcheng@espressif.com>
Date: Tue, 7 Jul 2020 20:55:57 +0800
Subject: [PATCH] component/bt: Fixed ble memory leak issue, buff_semaphore was
 not released.

---
 .../bt/host/bluedroid/stack/l2cap/l2c_api.c   | 29 +++++++++++++++----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/components/bt/host/bluedroid/stack/l2cap/l2c_api.c b/components/bt/host/bluedroid/stack/l2cap/l2c_api.c
index 859389c073..ab9fa00715 100644
--- a/components/bt/host/bluedroid/stack/l2cap/l2c_api.c
+++ b/components/bt/host/bluedroid/stack/l2cap/l2c_api.c
@@ -2274,7 +2274,6 @@ UINT16 L2CA_FlushChannel (UINT16 lcid, UINT16 num_to_flush)
     return (num_left);
 }
 
-
 /******************************************************************************
 **
 ** Function         update_acl_pkt_num
@@ -2284,7 +2283,6 @@ UINT16 L2CA_FlushChannel (UINT16 lcid, UINT16 num_to_flush)
 ** Returns          None
 **
 *******************************************************************************/
-
 #if BLE_INCLUDED == TRUE
 void l2ble_update_att_acl_pkt_num(UINT8 type, tl2c_buff_param_t *param)
 {
@@ -2292,28 +2290,38 @@ void l2ble_update_att_acl_pkt_num(UINT8 type, tl2c_buff_param_t *param)
     static INT16 btc_buf;
     static INT16 btu_buf;
 
-    if(buff_semaphore != NULL){
-        xSemaphoreTake(buff_semaphore, 10 / portTICK_PERIOD_MS);
+    if(buff_semaphore == NULL && type != L2CA_BUFF_INI){
+        L2CAP_TRACE_ERROR("%s buff_semaphore not init", __func__);
+        return;
     }
     switch (type)
     {
     case L2CA_ADD_BTC_NUM:{
+        xSemaphoreTake(buff_semaphore, portMAX_DELAY);
         btc_buf ++;
+        xSemaphoreGive(buff_semaphore);
         break;
     }
     case L2CA_DECREASE_BTC_NUM:{
+        xSemaphoreTake(buff_semaphore, portMAX_DELAY);
         btc_buf --;
+        xSemaphoreGive(buff_semaphore);
         break;
     }
     case L2CA_ADD_BTU_NUM:{
+        xSemaphoreTake(buff_semaphore, portMAX_DELAY);
         btu_buf ++;
+        xSemaphoreGive(buff_semaphore);
         break;
     }
     case L2CA_DECREASE_BTU_NUM:{
+        xSemaphoreTake(buff_semaphore, portMAX_DELAY);
         btu_buf --;
+        xSemaphoreGive(buff_semaphore);
         break;
     }
     case L2CA_GET_ATT_NUM:{
+        xSemaphoreTake(buff_semaphore, portMAX_DELAY);
         INT16 att_acl_pkt_num = 0;
         INT16 att_max_num = 0;
         *(param->get_num) = 0;
@@ -2321,17 +2329,20 @@ void l2ble_update_att_acl_pkt_num(UINT8 type, tl2c_buff_param_t *param)
         tGATT_TCB * p_tcb = gatt_get_tcb_by_idx(tcb_idx);
         if (p_tcb == NULL){
             L2CAP_TRACE_ERROR("%s not found p_tcb", __func__);
+            xSemaphoreGive(buff_semaphore);
             break;
         }
         tL2C_LCB * p_lcb = l2cu_find_lcb_by_bd_addr (p_tcb->peer_bda, BT_TRANSPORT_LE);
         if (p_lcb == NULL){
             L2CAP_TRACE_ERROR("%s not found p_lcb", __func__);
+            xSemaphoreGive(buff_semaphore);
             break;
         }
         fixed_queue_t * queue = p_lcb->p_fixed_ccbs[L2CAP_ATT_CID - L2CAP_FIRST_FIXED_CHNL]->xmit_hold_q;
         att_max_num = MIN(p_lcb->link_xmit_quota, L2CAP_CACHE_ATT_ACL_NUM);
         if (queue == NULL){
             L2CAP_TRACE_ERROR("%s not found queue", __func__);
+            xSemaphoreGive(buff_semaphore);
             break;
         }
         att_acl_pkt_num = fixed_queue_length(queue);
@@ -2340,23 +2351,31 @@ void l2ble_update_att_acl_pkt_num(UINT8 type, tl2c_buff_param_t *param)
                 *(param->get_num) = att_max_num - att_acl_pkt_num - (btc_buf + btu_buf);
             }
         }
+        xSemaphoreGive(buff_semaphore);
         break;
     }
     case L2CA_BUFF_INI:{
         btc_buf = 0;
         btu_buf = 0;
         buff_semaphore = xSemaphoreCreateBinary();
+        if (buff_semaphore == NULL) {
+            L2CAP_TRACE_ERROR("%s NO MEMORY", __func__);
+            break;
+        }
         xSemaphoreGive(buff_semaphore);
         break;
     }
     case L2CA_BUFF_DEINIT:{
+        xSemaphoreTake(buff_semaphore, portMAX_DELAY);
         btc_buf = 0;
         btu_buf = 0;
+        xSemaphoreGive(buff_semaphore);
+        vSemaphoreDelete(buff_semaphore);
+        buff_semaphore = NULL;
         break;
     }
     default:
         break;
     }
-    xSemaphoreGive(buff_semaphore);
 }
 #endif
\ No newline at end of file