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authorJohannes Berg <johannes.berg@intel.com>2016-03-31 17:22:45 +0200
committerJohannes Berg <johannes.berg@intel.com>2016-04-05 10:58:30 +0200
commit62b14b241ca6f790a17ccd9dd9f62ce1b006d406 (patch)
tree839a88f8cfc4599aafff36d23625b7c5f38c2836 /net/mac80211/sta_info.c
parentaa507a7bc5ab7513b83fc37ed040b5254737a518 (diff)
mac80211: properly deal with station hashtable insert errors
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@vger.kernel.org Fixes: 7bedd0cfad4e1 ("mac80211: use rhashtable for station table") Reported-by: Ben Greear <greearb@candelatech.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/sta_info.c')
-rw-r--r--net/mac80211/sta_info.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index d20bab5c146c..18b56d7a2dbd 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);