fix(bt): Fix the critical issues related to A2DP from AI review report

AVDT:
- Roll back CCB allocation when cmd/rsp queue creation fails
- Free media packet on invalid handle in AVDT_WriteReqOpt
- Zero-init timeout failure message before GETCAP callback
- Initialize lcid_tbl to 0xFF to avoid mapping to tc_tbl[0]
BTA/AVRCP:
- Use size_t for AVRC message copy buffer allocation
- Allocate before register in BTA_AvEnable
- Guard BTA_AvRegister callback when enable never completed
A2DP BTC/API:
- Default g_a2dp_on_deinit to true before profile init
- Add shutdown state check in btc_a2dp_sink_shutdown
- Guard A2DP source timer against freed dynamic local param

components/bt/host/bluedroid/bta/av/bta_av_act.c

@@ -254,8 +254,8 @@ static void bta_av_rc_msg_cback(UINT8 handle, UINT8 label, UINT8 opcode, tAVRC_M
     }
 
     /* Create a copy of the message */
-    tBTA_AV_RC_MSG *p_buf =
-        (tBTA_AV_RC_MSG *)osi_malloc((UINT16)(sizeof(tBTA_AV_RC_MSG) + data_len));
+    size_t buf_size = sizeof(tBTA_AV_RC_MSG) + data_len;
+    tBTA_AV_RC_MSG *p_buf = (tBTA_AV_RC_MSG *)osi_malloc(buf_size);
     if (p_buf != NULL) {
         p_buf->hdr.event = BTA_AV_AVRC_MSG_EVT;
         p_buf->handle = handle;

components/bt/host/bluedroid/bta/av/bta_av_api.c

@@ -60,16 +60,18 @@ void BTA_AvEnable(tBTA_SEC sec_mask, tBTA_AV_FEAT features, tBTA_AV_CBACK *p_cba
 {
     tBTA_AV_API_ENABLE  *p_buf;
 
+    if ((p_buf = (tBTA_AV_API_ENABLE *) osi_malloc(sizeof(tBTA_AV_API_ENABLE))) == NULL) {
+        return;
+    }
+
     /* register with BTA system manager */
     bta_sys_register(BTA_ID_AV, &bta_av_reg);
 
-    if ((p_buf = (tBTA_AV_API_ENABLE *) osi_malloc(sizeof(tBTA_AV_API_ENABLE))) != NULL) {
-        p_buf->hdr.event = BTA_AV_API_ENABLE_EVT;
-        p_buf->p_cback  = p_cback;
-        p_buf->features = features;
-        p_buf->sec_mask = sec_mask;
-        bta_sys_sendmsg(p_buf);
-    }
+    p_buf->hdr.event = BTA_AV_API_ENABLE_EVT;
+    p_buf->p_cback  = p_cback;
+    p_buf->features = features;
+    p_buf->sec_mask = sec_mask;
+    bta_sys_sendmsg(p_buf);
 }
 
 /*******************************************************************************

components/bt/host/bluedroid/bta/av/bta_av_main.c

@@ -748,7 +748,9 @@ static void bta_av_api_register(tBTA_AV_DATA *p_data)
     } while (0);
 
     /* call callback with register event */
-    (*bta_av_cb.p_cback)(BTA_AV_REGISTER_EVT, (tBTA_AV *)&av_reg);
+    if (bta_av_cb.p_cback != NULL) {
+        (*bta_av_cb.p_cback)(BTA_AV_REGISTER_EVT, (tBTA_AV *)&av_reg);
+    }
 }
 
 /*******************************************************************************

components/bt/host/bluedroid/btc/profile/std/a2dp/btc_a2dp_sink.c

@@ -236,6 +236,11 @@ error_exit:;
 
 void btc_a2dp_sink_shutdown(void)
 {
+    if (btc_a2dp_sink_state != BTC_A2DP_SINK_STATE_ON) {
+        APPL_TRACE_ERROR("a2dp sink already shutdown");
+        return;
+    }
+
     APPL_TRACE_EVENT("## A2DP SINK STOP MEDIA THREAD ##\n");
 
     // Exit thread

components/bt/host/bluedroid/btc/profile/std/a2dp/btc_a2dp_source.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015-2023 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2015-2026 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -412,6 +412,11 @@ static void log_tstamps_us(char *comment)
 {
     static UINT64 prev_us = 0;
     UINT64 now_us = time_now_us();
+#if A2D_DYNAMIC_MEMORY == TRUE
+    if (a2dp_source_local_param_ptr == NULL) {
+        return;
+    }
+#endif
     APPL_TRACE_DEBUG("[%s] ts %08llu, diff : %08llu, queue sz %d", comment, now_us, now_us - prev_us,
                      fixed_queue_length(a2dp_source_local_param.btc_aa_src_cb.TxAaQ));
     prev_us = now_us;
@@ -1492,6 +1497,11 @@ static void btc_a2dp_source_handle_timer(UNUSED_ATTR void *context)
     if (btc_a2dp_source_state != BTC_A2DP_SOURCE_STATE_ON || g_a2dp_source_ongoing_deinit){
         return;
     }
+#if A2D_DYNAMIC_MEMORY == TRUE
+    if (a2dp_source_local_param_ptr == NULL) {
+        return;
+    }
+#endif
 
     if (a2dp_source_local_param.btc_aa_src_cb.is_tx_timer == TRUE) {
         btc_a2dp_source_send_aa_frame();

components/bt/host/bluedroid/btc/profile/std/a2dp/btc_av.c

@@ -39,7 +39,7 @@ bool g_av_with_rc;
 // global variable to indicate a2dp is initialized
 bool g_a2dp_on_init;
 // global variable to indicate a2dp is deinitialized
-bool g_a2dp_on_deinit;
+bool g_a2dp_on_deinit = true;
 // global variable to indicate a2dp source deinitialization is ongoing
 bool g_a2dp_source_ongoing_deinit;
 // global variable to indicate a2dp sink deinitialization is ongoing

components/bt/host/bluedroid/stack/avdt/avdt_ad.c

@@ -110,6 +110,11 @@ void avdt_ad_init(void)
     tAVDT_TC_TBL    *p_tbl = avdt_cb.ad.tc_tbl;
     memset(&avdt_cb.ad, 0, sizeof(tAVDT_AD));
 
+    /* 0 is a valid tc_tbl index; use invalid marker for unassigned LCIDs */
+    for (i = 0; i < MAX_L2CAP_CHANNELS; i++) {
+        avdt_cb.ad.lcid_tbl[i] = 0xFF;
+    }
+
     /* make sure the peer_mtu is a valid value */
     for (i = 0; i < AVDT_NUM_TC_TBL; i++, p_tbl++) {
         p_tbl->peer_mtu = L2CAP_DEFAULT_MTU;

components/bt/host/bluedroid/stack/avdt/avdt_api.c

@@ -909,6 +909,7 @@ UINT16 AVDT_WriteReqOpt(UINT8 handle, BT_HDR *p_pkt, UINT32 time_stamp, UINT8 m_
     }
     /* map handle to scb */
     if ((p_scb = avdt_scb_by_hdl(handle)) == NULL) {
+        osi_free(p_pkt);
         result = AVDT_BAD_HANDLE;
     } else {
         evt.apiwrite.p_buf = p_pkt;

components/bt/host/bluedroid/stack/avdt/avdt_ccb.c

@@ -383,6 +383,12 @@ tAVDT_CCB *avdt_ccb_alloc(BD_ADDR bd_addr)
             memcpy(p_ccb->peer_addr, bd_addr, BD_ADDR_LEN);
             p_ccb->cmd_q = fixed_queue_new(QUEUE_SIZE_MAX);
             p_ccb->rsp_q = fixed_queue_new(QUEUE_SIZE_MAX);
+            if (p_ccb->cmd_q == NULL || p_ccb->rsp_q == NULL) {
+                AVDT_TRACE_ERROR("avdt_ccb_alloc: queue alloc failed");
+                avdt_ccb_dealloc(p_ccb, NULL);
+                p_ccb = NULL;
+                break;
+            }
             p_ccb->timer_entry.param = (UINT32) p_ccb;
             AVDT_TRACE_DEBUG("avdt_ccb_alloc %d\n", i);
             break;

components/bt/host/bluedroid/stack/avdt/avdt_ccb_act.c

@@ -712,6 +712,8 @@ void avdt_ccb_cmd_fail(tAVDT_CCB *p_ccb, tAVDT_CCB_EVT *p_data)
     UINT8           evt;
     tAVDT_SCB       *p_scb;
 
+    memset(&msg, 0, sizeof(msg));
+
     if (p_ccb->p_curr_cmd != NULL) {
         if (p_ccb->p_curr_cmd->event < 1 || p_ccb->p_curr_cmd->event > AVDT_SIG_MAX) {
             osi_free(p_ccb->p_curr_cmd);