staging: rtl8723bs: remove unreachable code in

PATCH In review Nikolay Kulikov 2 participants 4 messages Jun 1 – Jun 2 Staging

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Nikolay Kulikov

author

2026-06-01 15:03 UTC #0 lore raw

cover staging: rtl8723bs: remove unreachable code in

This series removes an unreachable switch-case branch in the update_beacon() function. This branch doesn't check the value of the 'oui' pointer, which could lead to a NULL dereference.

Found with cppcheck:

	core/rtw_ap.c:1404:27: error: Null pointer dereference: oui [ctunullpointer]
	 if (!memcmp(RTW_WPA_OUI, oui, 4))
				  ^
	core/rtw_ap.c:235:19: note: Calling function update_beacon, 3rd argument is null
	     update_beacon(padapter, WLAN_EID_TIM, NULL, true);
			  ^
	core/rtw_ap.c:1472:3: note: Calling function update_bcn_vendor_spec_ie, 2nd argument is null
	  update_bcn_vendor_spec_ie(padapter, oui);
	  ^
	core/rtw_ap.c:1404:27: note: Dereferencing argument oui that is null
	 if (!memcmp(RTW_WPA_OUI, oui, 4))
                          ^

Nikolay Kulikov (2):
staging: rtl8723bs: remove unused case from update_beacon()
staging: rtl8723bs: remove unused 'oui' parameter from update_beacon()

 drivers/staging/rtl8723bs/core/rtw_ap.c    | 116 +++------------------
 drivers/staging/rtl8723bs/core/rtw_cmd.c   |   2 +-
 drivers/staging/rtl8723bs/core/rtw_recv.c  |   4 +-
 drivers/staging/rtl8723bs/core/rtw_xmit.c  |   8 +-
 drivers/staging/rtl8723bs/include/rtw_ap.h |   2 +-
 5 files changed, 24 insertions(+), 108 deletions(-)

base-commit: 7cb1c5b32a2bfde961fff8d5204526b609bcb30a

Signature · 1 line

2.54.0

Nikolay Kulikov

author

2026-06-01 15:03 UTC #1 lore raw

PATCH 1/2 staging: rtl8723bs: remove unused case from update_beacon()

The update_beacon() function is never called with 'ie_id' equal to 'WLAN_EID_VENDOR_SPECIFIC', meaning this case branch will never be called, so remove it and several related functions.

Removing this case branch also fixes a possible null pointer dereference in update_bcn_vendor_spec() if 'oui' is NULL, since its value is not checked in any way.

Signed-off-by Nikolay Kulikov <[email protected]>

---
 drivers/staging/rtl8723bs/core/rtw_ap.c | 84 -------------------------
 1 file changed, 84 deletions(-)

drivers/staging/rtl8723bs/core/rtw_ap.c +0 ~~-84~~

index 065850a9e894..316f879923f5 100644
@@ -1336,84 +1336,6 @@ static void update_bcn_rsn_ie(struct adapter *padapter)
 {
 }
 
-static void update_bcn_wpa_ie(struct adapter *padapter)
-{
-}
-
-static void update_bcn_wmm_ie(struct adapter *padapter)
-{
-}
-
-static void update_bcn_wps_ie(struct adapter *padapter)
-{
-	u8 *pwps_ie = NULL;
-	u8 *pwps_ie_src;
-	u8 *premainder_ie;
-	u8 *pbackup_remainder_ie = NULL;
-
-	unsigned int wps_ielen = 0, wps_offset, remainder_ielen;
-	struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
-	struct mlme_ext_priv *pmlmeext = &padapter->mlmeextpriv;
-	struct mlme_ext_info *pmlmeinfo = &pmlmeext->mlmext_info;
-	struct wlan_bssid_ex *pnetwork = &pmlmeinfo->network;
-	unsigned char *ie = pnetwork->ies;
-	u32 ielen = pnetwork->ie_length;
-
-	pwps_ie = rtw_get_wps_ie(ie + _FIXED_IE_LENGTH_,
-				 ielen - _FIXED_IE_LENGTH_,
-				 NULL,
-				 &wps_ielen);
-
-	if (!pwps_ie || wps_ielen == 0)
-		return;
-
-	pwps_ie_src = pmlmepriv->wps_beacon_ie;
-	if (!pwps_ie_src)
-		return;
-
-	wps_offset = (unsigned int)(pwps_ie - ie);
-
-	premainder_ie = pwps_ie + wps_ielen;
-
-	remainder_ielen = ielen - wps_offset - wps_ielen;
-
-	if (remainder_ielen)
-		pbackup_remainder_ie = kmemdup(premainder_ie, remainder_ielen, GFP_ATOMIC);
-
-	wps_ielen = (unsigned int)pwps_ie_src[1];/* to get ie data len */
-	if ((wps_offset + wps_ielen + 2 + remainder_ielen) <= MAX_IE_SZ) {
-		memcpy(pwps_ie, pwps_ie_src, wps_ielen + 2);
-		pwps_ie += (wps_ielen + 2);
-
-		if (pbackup_remainder_ie)
-			memcpy(pwps_ie, pbackup_remainder_ie, remainder_ielen);
-
-		/* update ie_length */
-		pnetwork->ie_length = wps_offset + (wps_ielen + 2) + remainder_ielen;
-	}
-
-	kfree(pbackup_remainder_ie);
-}
-
-static void update_bcn_p2p_ie(struct adapter *padapter)
-{
-}
-
-static void update_bcn_vendor_spec_ie(struct adapter *padapter, u8 *oui)
-{
-	if (!memcmp(RTW_WPA_OUI, oui, 4))
-		update_bcn_wpa_ie(padapter);
-
-	else if (!memcmp(WMM_OUI, oui, 4))
-		update_bcn_wmm_ie(padapter);
-
-	else if (!memcmp(WPS_OUI, oui, 4))
-		update_bcn_wps_ie(padapter);
-
-	else if (!memcmp(P2P_OUI, oui, 4))
-		update_bcn_p2p_ie(padapter);
-}
-
 void update_beacon(struct adapter *padapter, u8 ie_id, u8 *oui, u8 tx)
 {
 	struct mlme_priv *pmlmepriv;

@@ -1467,12 +1389,6 @@ void update_beacon(struct adapter *padapter, u8 ie_id, u8 *oui, u8 tx)
 
 		break;
 
-	case WLAN_EID_VENDOR_SPECIFIC:
-
-		update_bcn_vendor_spec_ie(padapter, oui);
-
-		break;
-
 	default:
 		break;
 	}

Signature · 1 line

2.54.0

Nikolay Kulikov

author

2026-06-01 15:03 UTC #2 lore raw

PATCH 2/2 staging: rtl8723bs: remove unused 'oui' parameter from update_beacon()

In reply to Nikolay Kulikov

After deleting one of the switch-case branches, this parameter became unused, so remove it.

Signed-off-by Nikolay Kulikov <[email protected]>

---
 drivers/staging/rtl8723bs/core/rtw_ap.c    | 32 +++++++++++-----------
 drivers/staging/rtl8723bs/core/rtw_cmd.c   |  2 +-
 drivers/staging/rtl8723bs/core/rtw_recv.c  |  4 +--
 drivers/staging/rtl8723bs/core/rtw_xmit.c  |  8 +++---
 drivers/staging/rtl8723bs/include/rtw_ap.h |  2 +-
 5 files changed, 24 insertions(+), 24 deletions(-)

drivers/staging/rtl8723bs/core/rtw_ap.c +16 ~~-16~~

index 316f879923f5..febeb66469f5 100644
@@ -232,7 +232,7 @@ void expire_timeout_chk(struct adapter *padapter)
 
 					/* to update bcn with tim_bitmap for this station */
 					pstapriv->tim_bitmap |= BIT(psta->aid);
-					update_beacon(padapter, WLAN_EID_TIM, NULL, true);
+					update_beacon(padapter, WLAN_EID_TIM, true);
 
 					if (!pmlmeext->active_keep_alive_check)
 						continue;

@@ -739,7 +739,7 @@ void start_bss_network(struct adapter *padapter)
 		       rtw_get_capability((struct wlan_bssid_ex *)pnetwork));
 
 	if (pmlmeext->bstart_bss) {
-		update_beacon(padapter, WLAN_EID_TIM, NULL, true);
+		update_beacon(padapter, WLAN_EID_TIM, true);
 
 		/* issue beacon frame */
 		send_beacon(padapter);

@@ -1336,7 +1336,7 @@ static void update_bcn_rsn_ie(struct adapter *padapter)
 {
 }
 
-void update_beacon(struct adapter *padapter, u8 ie_id, u8 *oui, u8 tx)
+void update_beacon(struct adapter *padapter, u8 ie_id, u8 tx)
 {
 	struct mlme_priv *pmlmepriv;
 	struct mlme_ext_priv *pmlmeext;

@@ -1513,7 +1513,7 @@ void bss_cap_update_on_sta_join(struct adapter *padapter, struct sta_info *psta)
 			if ((pmlmeext->cur_wireless_mode > WIRELESS_11B) &&
 			    (pmlmepriv->num_sta_no_short_preamble == 1)) {
 				beacon_updated = true;
-				update_beacon(padapter, 0xFF, NULL, true);
+				update_beacon(padapter, 0xFF, true);
 			}
 		}
 	} else {

@@ -1525,7 +1525,7 @@ void bss_cap_update_on_sta_join(struct adapter *padapter, struct sta_info *psta)
 			if ((pmlmeext->cur_wireless_mode > WIRELESS_11B) &&
 			    (pmlmepriv->num_sta_no_short_preamble == 0)) {
 				beacon_updated = true;
-				update_beacon(padapter, 0xFF, NULL, true);
+				update_beacon(padapter, 0xFF, true);
 			}
 		}
 	}

@@ -1538,7 +1538,7 @@ void bss_cap_update_on_sta_join(struct adapter *padapter, struct sta_info *psta)
 
 			if (pmlmepriv->num_sta_non_erp == 1) {
 				beacon_updated = true;
-				update_beacon(padapter, WLAN_EID_ERP_INFO, NULL, true);
+				update_beacon(padapter, WLAN_EID_ERP_INFO, true);
 			}
 		}
 	} else {

@@ -1549,7 +1549,7 @@ void bss_cap_update_on_sta_join(struct adapter *padapter, struct sta_info *psta)
 
 			if (pmlmepriv->num_sta_non_erp == 0) {
 				beacon_updated = true;
-				update_beacon(padapter, WLAN_EID_ERP_INFO, NULL, true);
+				update_beacon(padapter, WLAN_EID_ERP_INFO, true);
 			}
 		}
 	}

@@ -1563,7 +1563,7 @@ void bss_cap_update_on_sta_join(struct adapter *padapter, struct sta_info *psta)
 			if ((pmlmeext->cur_wireless_mode > WIRELESS_11B) &&
 			    (pmlmepriv->num_sta_no_short_slot_time == 1)) {
 				beacon_updated = true;
-				update_beacon(padapter, 0xFF, NULL, true);
+				update_beacon(padapter, 0xFF, true);
 			}
 		}
 	} else {

@@ -1575,7 +1575,7 @@ void bss_cap_update_on_sta_join(struct adapter *padapter, struct sta_info *psta)
 			if ((pmlmeext->cur_wireless_mode > WIRELESS_11B) &&
 			    (pmlmepriv->num_sta_no_short_slot_time == 0)) {
 				beacon_updated = true;
-				update_beacon(padapter, 0xFF, NULL, true);
+				update_beacon(padapter, 0xFF, true);
 			}
 		}
 	}

@@ -1610,8 +1610,8 @@ void bss_cap_update_on_sta_join(struct adapter *padapter, struct sta_info *psta)
 	}
 
 	if (rtw_ht_operation_update(padapter) > 0) {
-		update_beacon(padapter, WLAN_EID_HT_CAPABILITY, NULL, false);
-		update_beacon(padapter, WLAN_EID_HT_OPERATION, NULL, true);
+		update_beacon(padapter, WLAN_EID_HT_CAPABILITY, false);
+		update_beacon(padapter, WLAN_EID_HT_OPERATION, true);
 	}
 
 	/* update associated stations cap. */

@@ -1633,7 +1633,7 @@ u8 bss_cap_update_on_sta_leave(struct adapter *padapter, struct sta_info *psta)
 		if (pmlmeext->cur_wireless_mode > WIRELESS_11B &&
 		    pmlmepriv->num_sta_no_short_preamble == 0){
 			beacon_updated = true;
-			update_beacon(padapter, 0xFF, NULL, true);
+			update_beacon(padapter, 0xFF, true);
 		}
 	}

@@ -1642,7 +1642,7 @@ u8 bss_cap_update_on_sta_leave(struct adapter *padapter, struct sta_info *psta)
 		pmlmepriv->num_sta_non_erp--;
 		if (pmlmepriv->num_sta_non_erp == 0) {
 			beacon_updated = true;
-			update_beacon(padapter, WLAN_EID_ERP_INFO, NULL, true);
+			update_beacon(padapter, WLAN_EID_ERP_INFO, true);
 		}
 	}

@@ -1652,7 +1652,7 @@ u8 bss_cap_update_on_sta_leave(struct adapter *padapter, struct sta_info *psta)
 		if (pmlmeext->cur_wireless_mode > WIRELESS_11B &&
 		    pmlmepriv->num_sta_no_short_slot_time == 0){
 			beacon_updated = true;
-			update_beacon(padapter, 0xFF, NULL, true);
+			update_beacon(padapter, 0xFF, true);
 		}
 	}

@@ -1672,8 +1672,8 @@ u8 bss_cap_update_on_sta_leave(struct adapter *padapter, struct sta_info *psta)
 	}
 
 	if (rtw_ht_operation_update(padapter) > 0) {
-		update_beacon(padapter, WLAN_EID_HT_CAPABILITY, NULL, false);
-		update_beacon(padapter, WLAN_EID_HT_OPERATION, NULL, true);
+		update_beacon(padapter, WLAN_EID_HT_CAPABILITY, false);
+		update_beacon(padapter, WLAN_EID_HT_OPERATION, true);
 	}
 
 	return beacon_updated;

drivers/staging/rtl8723bs/core/rtw_cmd.c +1 -1

index b932670f5d63..f182b10b0f45 100644
@@ -1526,7 +1526,7 @@ static void rtw_chk_hi_queue_hdl(struct adapter *padapter)
 			pstapriv->sta_dz_bitmap &= ~BIT(0);
 
 			if (update_tim)
-				update_beacon(padapter, WLAN_EID_TIM, NULL, true);
+				update_beacon(padapter, WLAN_EID_TIM, true);
 		} else {/* re check again */
 			rtw_chk_hi_queue_cmd(padapter);
 		}

drivers/staging/rtl8723bs/core/rtw_recv.c +2 -2

index 86c5e2c4e7dd..a75231c55310 100644
@@ -1009,7 +1009,7 @@ static signed int validate_recv_ctrl_frame(struct adapter *padapter, union recv_
 
 					/* update BCN for TIM IE */
 					/* update_BCNTIM(padapter); */
-					update_beacon(padapter, WLAN_EID_TIM, NULL, true);
+					update_beacon(padapter, WLAN_EID_TIM, true);
 				}
 
 				/* spin_unlock_bh(&psta->sleep_q.lock); */

@@ -1031,7 +1031,7 @@ static signed int validate_recv_ctrl_frame(struct adapter *padapter, union recv_
 
 					/* update BCN for TIM IE */
 					/* update_BCNTIM(padapter); */
-					update_beacon(padapter, WLAN_EID_TIM, NULL, true);
+					update_beacon(padapter, WLAN_EID_TIM, true);
 				}
 			}
 		}

drivers/staging/rtl8723bs/core/rtw_xmit.c +4 -4

index 444966c0de7f..23136d985e7c 100644
@@ -2083,7 +2083,7 @@ signed int xmitframe_enqueue_for_sleeping_sta(struct adapter *padapter, struct x
 			pstapriv->sta_dz_bitmap |= BIT(0);
 
 			if (update_tim)
-				update_beacon(padapter, WLAN_EID_TIM, NULL, true);
+				update_beacon(padapter, WLAN_EID_TIM, true);
 			else
 				chk_bmc_sleepq_cmd(padapter);

@@ -2138,7 +2138,7 @@ signed int xmitframe_enqueue_for_sleeping_sta(struct adapter *padapter, struct x
 
 				if (update_tim)
 					/* update BCN for TIM IE */
-					update_beacon(padapter, WLAN_EID_TIM, NULL, true);
+					update_beacon(padapter, WLAN_EID_TIM, true);
 			}
 
 			ret = true;

@@ -2333,7 +2333,7 @@ void wakeup_sta_to_xmit(struct adapter *padapter, struct sta_info *psta)
 	spin_unlock_bh(&pxmitpriv->lock);
 
 	if (update_mask)
-		update_beacon(padapter, WLAN_EID_TIM, NULL, true);
+		update_beacon(padapter, WLAN_EID_TIM, true);
 }
 
 void xmit_delivery_enabled_frames(struct adapter *padapter, struct sta_info *psta)

@@ -2393,7 +2393,7 @@ void xmit_delivery_enabled_frames(struct adapter *padapter, struct sta_info *pst
 		if ((psta->sleepq_ac_len == 0) && (!psta->has_legacy_ac) && (wmmps_ac)) {
 			pstapriv->tim_bitmap &= ~BIT(psta->aid);
 
-			update_beacon(padapter, WLAN_EID_TIM, NULL, true);
+			update_beacon(padapter, WLAN_EID_TIM, true);
 		}
 	}

drivers/staging/rtl8723bs/include/rtw_ap.h +1 -1

index 83e835eb6513..866aa8386931 100644
@@ -10,7 +10,7 @@
 void init_mlme_ap_info(struct adapter *padapter);
 void free_mlme_ap_info(struct adapter *padapter);
 /* void update_BCNTIM(struct adapter *padapter); */
-void update_beacon(struct adapter *padapter, u8 ie_id, u8 *oui, u8 tx);
+void update_beacon(struct adapter *padapter, u8 ie_id, u8 tx);
 void add_ratid(struct adapter *padapter, struct sta_info *psta, u8 rssi_level);
 void expire_timeout_chk(struct adapter *padapter);
 void update_sta_info_apmode(struct adapter *padapter, struct sta_info *psta);

Signature · 1 line

2.54.0

Dan Carpenter

Reviewed-by on the v1 series

2026-06-02 05:35 UTC #3 lore raw

In reply to Nikolay Kulikov

Thanks!

Reviewed-by Dan Carpenter <[email protected]>

regards,
dan carpenter