From: Johannes Berg <johannes.berg@xxxxxxxxx>
The original hand-implemented hash-table in mac80211 couldn't result
in insertion errors, and while converting to rhashtable I evidently
forgot to check the errors.
This surfaced now only because Ben is adding many identical keys and
that resulted in hidden insertion errors.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 7bedd0cfad4e1 ("mac80211: use rhashtable for station table")
Reported-by: Ben Greear <greearb@xxxxxxxxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
net/mac80211/sta_info.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 00c82fb152c0..92f44bbc2719 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -258,11 +258,11 @@ void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
}
/* Caller must hold local->sta_mtx */
-static void sta_info_hash_add(struct ieee80211_local *local,
- struct sta_info *sta)
+static int sta_info_hash_add(struct ieee80211_local *local,
+ struct sta_info *sta)
{
- rhashtable_insert_fast(&local->sta_hash, &sta->hash_node,
- sta_rht_params);
+ return rhashtable_insert_fast(&local->sta_hash, &sta->hash_node,
+ sta_rht_params);
}
static void sta_deliver_ps_frames(struct work_struct *wk)
@@ -524,7 +524,9 @@ static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
set_sta_flag(sta, WLAN_STA_BLOCK_BA);
/* make the station visible */
- sta_info_hash_add(local, sta);
+ err = sta_info_hash_add(local, sta);
+ if (err)
+ goto out_drop_sta;
list_add_tail_rcu(&sta->list, &local->sta_list);
@@ -557,6 +559,7 @@ static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
out_remove:
sta_info_hash_del(local, sta);
list_del_rcu(&sta->list);
+ out_drop_sta:
local->num_sta--;
synchronize_net();
__cleanup_single_sta(sta);
--
2.7.0
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