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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: 7bedd0cfad ("mac80211: use rhashtable for station table")
Reported-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2016-03-31 17:22:45 +02:00
parent aa507a7bc5
commit 62b14b241c
1 changed files with 8 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
net/mac80211/sta_info.c
View File

@ -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);