cfg80211: Properly track transmitting and non-transmitting BSS

When holding data of the non-transmitting BSS, we need to keep the
transmitting BSS data on. Otherwise it will be released, and release
the non-transmitting BSS with it.

Signed-off-by: Sara Sharon <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>

Author: sara-s

net/wireless/core.h

@@ -153,6 +153,7 @@ struct cfg80211_internal_bss {
 	struct list_head list;
 	struct list_head hidden_list;
 	struct list_head nontrans_list;
+	struct cfg80211_bss *transmitted_bss;
 	struct rb_node rbn;
 	u64 ts_boottime;
 	unsigned long ts;
@@ -183,12 +184,23 @@ static inline struct cfg80211_internal_bss *bss_from_pub(struct cfg80211_bss *pu
 static inline void cfg80211_hold_bss(struct cfg80211_internal_bss *bss)
 {
 	atomic_inc(&bss->hold);
+	if (bss->transmitted_bss) {
+		bss = container_of(bss->transmitted_bss,
+				   struct cfg80211_internal_bss, pub);
+		atomic_inc(&bss->hold);
+	}
 }
 
 static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss)
 {
 	int r = atomic_dec_return(&bss->hold);
 	WARN_ON(r < 0);
+	if (bss->transmitted_bss) {
+		bss = container_of(bss->transmitted_bss,
+				   struct cfg80211_internal_bss, pub);
+		r = atomic_dec_return(&bss->hold);
+		WARN_ON(r < 0);
+	}
 }
 
 

net/wireless/scan.c

@@ -110,6 +110,12 @@ static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
 				   pub);
 		bss->refcount++;
 	}
+	if (bss->transmitted_bss) {
+		bss = container_of(bss->transmitted_bss,
+				   struct cfg80211_internal_bss,
+				   pub);
+		bss->refcount++;
+	}
 }
 
 static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
@@ -126,6 +132,18 @@ static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
 		if (hbss->refcount == 0)
 			bss_free(hbss);
 	}
+
+	if (bss->transmitted_bss) {
+		struct cfg80211_internal_bss *tbss;
+
+		tbss = container_of(bss->transmitted_bss,
+				    struct cfg80211_internal_bss,
+				    pub);
+		tbss->refcount--;
+		if (tbss->refcount == 0)
+			bss_free(tbss);
+	}
+
 	bss->refcount--;
 	if (bss->refcount == 0)
 		bss_free(bss);
@@ -1024,6 +1042,7 @@ static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
 static struct cfg80211_internal_bss *
 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
 		    struct cfg80211_internal_bss *tmp,
+		    struct cfg80211_bss *trans_bss,
 		    bool signal_valid)
 {
 	struct cfg80211_internal_bss *found = NULL;
@@ -1181,6 +1200,17 @@ cfg80211_bss_update(struct cfg80211_registered_device *rdev,
 			goto drop;
 		}
 
+		/* This must be before the call to bss_ref_get */
+		if (trans_bss) {
+			struct cfg80211_internal_bss *pbss =
+				container_of(trans_bss,
+					     struct cfg80211_internal_bss,
+					     pub);
+
+			new->transmitted_bss = trans_bss;
+			bss_ref_get(rdev, pbss);
+		}
+
 		list_add_tail(&new->list, &rdev->bss_list);
 		rdev->bss_entries++;
 		rb_insert_bss(rdev, new);
@@ -1336,7 +1366,8 @@ cfg80211_inform_single_bss_data(struct wiphy *wiphy,
 
 	signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
 		wiphy->max_adj_channel_rssi_comp;
-	res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
+	res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, trans_bss,
+				  signal_valid);
 	if (!res)
 		return NULL;
 
@@ -1639,7 +1670,8 @@ cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
 
 	signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
 		wiphy->max_adj_channel_rssi_comp;
-	res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
+	res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, trans_bss,
+				  signal_valid);
 	if (!res)
 		return NULL;