mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-23 15:32:33 +00:00
38 lines
1.4 KiB
Diff
38 lines
1.4 KiB
Diff
From: Johannes Berg <johannes.berg@intel.com>
|
|
Date: Mon, 20 Nov 2017 17:01:44 +0100
|
|
Subject: [PATCH] mac80211: properly free requested-but-not-started TX agg
|
|
sessions
|
|
|
|
When deleting a station or otherwise tearing down all aggregation
|
|
sessions, make sure to delete requested but not yet started ones,
|
|
to avoid the following scenario:
|
|
|
|
* session is requested, added to tid_start_tx[]
|
|
* ieee80211_ba_session_work() runs, gets past BLOCK_BA check
|
|
* ieee80211_sta_tear_down_BA_sessions() runs, locks &sta->ampdu_mlme.mtx,
|
|
e.g. while deleting the station - deleting all active sessions
|
|
* ieee80211_ba_session_work() continues since tear down flushes it, and
|
|
calls ieee80211_tx_ba_session_handle_start() for the new session, arms
|
|
the timer for it
|
|
* station deletion continues to __cleanup_single_sta() and frees the
|
|
session struct, while the timer is armed
|
|
|
|
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
|
|
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
|
|
---
|
|
|
|
--- a/net/mac80211/agg-tx.c
|
|
+++ b/net/mac80211/agg-tx.c
|
|
@@ -330,6 +330,11 @@ int ___ieee80211_stop_tx_ba_session(stru
|
|
|
|
spin_lock_bh(&sta->lock);
|
|
|
|
+ /* free struct pending for start, if present */
|
|
+ tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
|
|
+ kfree(tid_tx);
|
|
+ sta->ampdu_mlme.tid_start_tx[tid] = NULL;
|
|
+
|
|
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
|
|
if (!tid_tx) {
|
|
spin_unlock_bh(&sta->lock);
|