qcacld-3.0: Fix NULL pointer dereference issue in DP

Pointer 'dp_ctx' returned from call to function 'dp_psoc_get_priv'
may be NULL in below APIs:
1. dp_reset_tcp_delack
2. dp_bus_bandwidth_init
3. dp_bus_bandwidth_deinit
4. dp_bus_bw_compute_timer_try_start
5. dp_bus_bw_compute_timer_try_stop
6. ucfg_dp_set_cmn_dp_handle
7. __dp_bus_bw_compute_timer_start

Fix is to add NULL check for dp_ctx before use.

Change-Id: I5f9ea6ae8ce3bb13631ad9a2dfe25d9c3686a33b
CRs-Fixed: 3767091

components/dp/core/src/wlan_dp_bus_bandwidth.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -653,6 +653,11 @@ void dp_reset_tcp_delack(struct wlan_objmgr_psoc *psoc)
 	enum wlan_tp_level next_level = WLAN_SVC_TP_LOW;
 	struct wlan_rx_tp_data rx_tp_data = {0};
 
+	if (!dp_ctx) {
+		dp_err("Unable to get DP context");
+		return;
+	}
+
 	if (!dp_ctx->en_tcp_delack_no_lro)
 		return;
 
@@ -2063,6 +2068,11 @@ static void dp_bus_bw_work_handler(void *context)
 	struct wlan_dp_psoc_context *dp_ctx = context;
 	struct qdf_op_sync *op_sync;
 
+	if (!dp_ctx) {
+		dp_err("Unable to get DP context");
+		return;
+	}
+
 	if (qdf_op_protect(&op_sync))
 		return;
 
@@ -2099,7 +2109,14 @@ int dp_bus_bandwidth_init(struct wlan_objmgr_psoc *psoc)
 void dp_bus_bandwidth_deinit(struct wlan_objmgr_psoc *psoc)
 {
 	struct wlan_dp_psoc_context *dp_ctx = dp_psoc_get_priv(psoc);
-	hdd_cb_handle ctx = dp_ctx->dp_ops.callback_ctx;
+	hdd_cb_handle ctx;
+
+	if (!dp_ctx) {
+		dp_err("Unable to get DP context");
+		return;
+	}
+
+	ctx = dp_ctx->dp_ops.callback_ctx;
 
 	if (QDF_GLOBAL_FTM_MODE == cds_get_conparam())
 		return;
@@ -2129,6 +2146,11 @@ static void __dp_bus_bw_compute_timer_start(struct wlan_objmgr_psoc *psoc)
 {
 	struct wlan_dp_psoc_context *dp_ctx = dp_psoc_get_priv(psoc);
 
+	if (!dp_ctx) {
+		dp_err("Unable to get DP context");
+		return;
+	}
+
 	if (QDF_GLOBAL_FTM_MODE == cds_get_conparam())
 		return;
 
@@ -2149,10 +2171,17 @@ void dp_bus_bw_compute_timer_start(struct wlan_objmgr_psoc *psoc)
 void dp_bus_bw_compute_timer_try_start(struct wlan_objmgr_psoc *psoc)
 {
 	struct wlan_dp_psoc_context *dp_ctx = dp_psoc_get_priv(psoc);
-	hdd_cb_handle ctx = dp_ctx->dp_ops.callback_ctx;
+	hdd_cb_handle ctx;
 
 	dp_enter();
 
+	if (!dp_ctx) {
+		dp_err("Unable to get DP context");
+		return;
+	}
+
+	ctx = dp_ctx->dp_ops.callback_ctx;
+
 	if (dp_ctx->dp_ops.dp_any_adapter_connected(ctx))
 		__dp_bus_bw_compute_timer_start(psoc);
 
@@ -2230,10 +2259,17 @@ void dp_bus_bw_compute_timer_stop(struct wlan_objmgr_psoc *psoc)
 void dp_bus_bw_compute_timer_try_stop(struct wlan_objmgr_psoc *psoc)
 {
 	struct wlan_dp_psoc_context *dp_ctx = dp_psoc_get_priv(psoc);
-	hdd_cb_handle ctx = dp_ctx->dp_ops.callback_ctx;
+	hdd_cb_handle ctx;
 
 	dp_enter();
 
+	if (!dp_ctx) {
+		dp_err("Unable to get DP context");
+		return;
+	}
+
+	ctx = dp_ctx->dp_ops.callback_ctx;
+
 	if (!dp_ctx->dp_ops.dp_any_adapter_connected(ctx))
 		__dp_bus_bw_compute_timer_stop(psoc);
 

components/dp/dispatcher/src/wlan_dp_ucfg_api.c

@@ -300,6 +300,11 @@ void ucfg_dp_set_cmn_dp_handle(struct wlan_objmgr_psoc *psoc,
 
 	dp_ctx = dp_psoc_get_priv(psoc);
 
+	if (!dp_ctx) {
+		dp_err("Unable to get DP context");
+		return;
+	}
+
 	dp_ctx->cdp_soc = soc;
 
 	soc_param.hal_soc_hdl = NULL;