staging: wfx: simplify memory allocation in wfx_update_filtering()

Original code did not handle case where kmalloc failed. By the way, it
is more convenient to allocate and build HIF message in
hif_set_beacon_filter_table() instead of to ask to caller function to
build it.

Fixes: 40115bbc ("staging: wfx: implement the rest of mac80211 API")
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20191008094232.10014-2-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/hif_tx_mib.h

@@ -86,13 +86,22 @@ static inline int hif_set_rx_filter(struct wfx_vif *wvif, bool filter_bssid,
 }
 
 static inline int hif_set_beacon_filter_table(struct wfx_vif *wvif,
-					      struct hif_mib_bcn_filter_table *ft)
+					      int tbl_len,
+					      struct hif_ie_table_entry *tbl)
 {
-	size_t buf_len = struct_size(ft, ie_table, ft->num_of_info_elmts);
-
-	cpu_to_le32s(&ft->num_of_info_elmts);
-	return hif_write_mib(wvif->wdev, wvif->id,
-			     HIF_MIB_ID_BEACON_FILTER_TABLE, ft, buf_len);
+	int ret;
+	struct hif_mib_bcn_filter_table *val;
+	int buf_len = struct_size(val, ie_table, tbl_len);
+
+	val = kzalloc(buf_len, GFP_KERNEL);
+	if (!val)
+		return -ENOMEM;
+	val->num_of_info_elmts = cpu_to_le32(tbl_len);
+	memcpy(val->ie_table, tbl, tbl_len * sizeof(*tbl));
+	ret = hif_write_mib(wvif->wdev, wvif->id,
+			    HIF_MIB_ID_BEACON_FILTER_TABLE, val, buf_len);
+	kfree(val);
+	return ret;
 }
 
 static inline int hif_beacon_filter_control(struct wfx_vif *wvif,

drivers/staging/wfx/sta.c

@@ -217,14 +217,13 @@ void wfx_update_filtering(struct wfx_vif *wvif)
 	bool filter_bssid = wvif->filter_bssid;
 	bool fwd_probe_req = wvif->fwd_probe_req;
 	struct hif_mib_bcn_filter_enable bf_ctrl;
-	struct hif_mib_bcn_filter_table *bf_tbl;
-	struct hif_ie_table_entry ie_tbl[] = {
+	struct hif_ie_table_entry filter_ies[] = {
 		{
 			.ie_id        = WLAN_EID_VENDOR_SPECIFIC,
 			.has_changed  = 1,
 			.no_longer    = 1,
 			.has_appeared = 1,
-			.oui         = { 0x50, 0x6F, 0x9A},
+			.oui          = { 0x50, 0x6F, 0x9A },
 		}, {
 			.ie_id        = WLAN_EID_HT_OPERATION,
 			.has_changed  = 1,
@@ -237,36 +236,34 @@ void wfx_update_filtering(struct wfx_vif *wvif)
 			.has_appeared = 1,
 		}
 	};
+	int n_filter_ies;
 
 	if (wvif->state == WFX_STATE_PASSIVE)
 		return;
 
-	bf_tbl = kmalloc(sizeof(struct hif_mib_bcn_filter_table) + sizeof(ie_tbl), GFP_KERNEL);
-	memcpy(bf_tbl->ie_table, ie_tbl, sizeof(ie_tbl));
 	if (wvif->disable_beacon_filter) {
 		bf_ctrl.enable = 0;
 		bf_ctrl.bcn_count = 1;
-		bf_tbl->num_of_info_elmts = 0;
+		n_filter_ies = 0;
 	} else if (!is_sta) {
 		bf_ctrl.enable = HIF_BEACON_FILTER_ENABLE | HIF_BEACON_FILTER_AUTO_ERP;
 		bf_ctrl.bcn_count = 0;
-		bf_tbl->num_of_info_elmts = 2;
+		n_filter_ies = 2;
 	} else {
 		bf_ctrl.enable = HIF_BEACON_FILTER_ENABLE;
 		bf_ctrl.bcn_count = 0;
-		bf_tbl->num_of_info_elmts = 3;
+		n_filter_ies = 3;
 	}
 
 	ret = hif_set_rx_filter(wvif, filter_bssid, fwd_probe_req);
 	if (!ret)
-		ret = hif_set_beacon_filter_table(wvif, bf_tbl);
+		ret = hif_set_beacon_filter_table(wvif, n_filter_ies, filter_ies);
 	if (!ret)
 		ret = hif_beacon_filter_control(wvif, bf_ctrl.enable, bf_ctrl.bcn_count);
 	if (!ret)
 		ret = wfx_set_mcast_filter(wvif, &wvif->mcast_filter);
 	if (ret)
 		dev_err(wvif->wdev->dev, "update filtering failed: %d\n", ret);
-	kfree(bf_tbl);
 }
 
 void wfx_update_filtering_work(struct work_struct *work)