From 69403bad97aa0162e3d7911b27e25abe774093df Mon Sep 17 00:00:00 2001
From: Alexander Wetzel <alexander@wetzel-home.de>
Date: Fri, 30 Dec 2022 13:18:50 +0100
Subject: [PATCH] wifi: mac80211: sdata can be NULL during AMPDU start
Git-commit: 69403bad97aa0162e3d7911b27e25abe774093df
Patch-mainline: v6.2-rc5
References: git-fixes
ieee80211_tx_ba_session_handle_start() may get NULL for sdata when a
deauthentication is ongoing.
Here a trace triggering the race with the hostapd test
Multi_ap_fronthaul_on_ap:
(gdb) list *drv_ampdu_action+0x46
0x8b16 is in drv_ampdu_action (net/mac80211/driver-ops.c:396).
391 int ret = -EOPNOTSUPP;
392
393 might_sleep();
394
395 sdata = get_bss_sdata(sdata);
396 if (!check_sdata_in_driver(sdata))
397 return -EIO;
398
399 trace_drv_ampdu_action(local, sdata, params);
400
Wlan0: moving STA 02:00:00:00:03:00 to state 3
Wlan0: associated
Wlan0: deauthenticating from 02:00:00:00:03:00 by local choice (Reason: 3=DEAUTH_LEAVING)
Wlan3.sta1: Open BA session requested for 02:00:00:00:00:00 tid 0
Wlan3.sta1: dropped frame to 02:00:00:00:00:00 (unauthorized port)
Wlan0: moving STA 02:00:00:00:03:00 to state 2
Wlan0: moving STA 02:00:00:00:03:00 to state 1
Wlan0: Removed STA 02:00:00:00:03:00
Wlan0: Destroyed STA 02:00:00:00:03:00
Bug: unable to handle page fault for address: fffffffffffffb48
PGD 11814067 P4D 11814067 PUD 11816067 PMD 0
Oops: 0000 [#1] PREEMPT SMP PTI
Cpu: 2 PID: 133397 Comm: kworker/u16:1 Tainted: G W 6.1.0-rc8-wt+ #59
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.0-20220807_005459-localhost 04/01/2014
Workqueue: phy3 ieee80211_ba_session_work [mac80211]
Rip: 0010:drv_ampdu_action+0x46/0x280 [mac80211]
Code: 53 48 89 f3 be 89 01 00 00 e8 d6 43 bf ef e8 21 46 81 f0 83 bb a0 1b 00 00 04 75 0e 48 8b 9b 28 0d 00 00 48 81 eb 10 0e 00 00 <8b> 93 58 09 00 00 f6 c2 20 0f 84 3b 01 00 00 8b 05 dd 1c 0f 00 85
Rsp: 0018:ffffc900025ebd20 EFLAGS: 00010287
Rax: 0000000000000000 RBX: fffffffffffff1f0 RCX: ffff888102228240
Rdx: 0000000080000000 RSI: ffffffff918c5de0 RDI: ffff888102228b40
Rbp: ffffc900025ebd40 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888118c18ec0
R13: 0000000000000000 R14: ffffc900025ebd60 R15: ffff888018b7efb8
Fs: 0000000000000000(0000) GS:ffff88817a600000(0000) knlGS:0000000000000000
Cs: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Cr2: fffffffffffffb48 CR3: 0000000105228006 CR4: 0000000000170ee0
Call Trace:
<TASK>
ieee80211_tx_ba_session_handle_start+0xd0/0x190 [mac80211]
ieee80211_ba_session_work+0xff/0x2e0 [mac80211]
process_one_work+0x29f/0x620
worker_thread+0x4d/0x3d0
? process_one_work+0x620/0x620
kthread+0xfb/0x120
? kthread_complete_and_exit+0x20/0x20
ret_from_fork+0x22/0x30
</TASK>
Signed-off-by: Alexander Wetzel <alexander@wetzel-home.de>
Link: https://lore.kernel.org/r/20221230121850.218810-2-alexander@wetzel-home.de
Cc: stable@vger.kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
net/mac80211/agg-tx.c | 6 +++++-
net/mac80211/driver-ops.c | 3 +++
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c
index 9c40f8d3bce8..3dbb724d7dc4 100644
--- a/net/mac80211/agg-tx.c
+++ b/net/mac80211/agg-tx.c
@@ -491,7 +491,7 @@ void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
{
struct tid_ampdu_tx *tid_tx;
struct ieee80211_local *local = sta->local;
- struct ieee80211_sub_if_data *sdata = sta->sdata;
+ struct ieee80211_sub_if_data *sdata;
struct ieee80211_ampdu_params params = {
.sta = &sta->sta,
.action = IEEE80211_AMPDU_TX_START,
@@ -521,6 +521,7 @@ void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
*/
synchronize_net();
+ sdata = sta->sdata;
params.ssn = sta->tid_seq[tid] >> 4;
ret = drv_ampdu_action(local, sdata, ¶ms);
tid_tx->ssn = params.ssn;
@@ -534,6 +535,9 @@ void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
*/
set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state);
} else if (ret) {
+ if (!sdata)
+ return;
+
ht_dbg(sdata,
"BA request denied - HW unavailable for %pM tid %d\n",
sta->sta.addr, tid);
diff --git a/net/mac80211/driver-ops.c b/net/mac80211/driver-ops.c
index d737db4e07e2..cfb09e4aed4d 100644
--- a/net/mac80211/driver-ops.c
+++ b/net/mac80211/driver-ops.c
@@ -392,6 +392,9 @@ int drv_ampdu_action(struct ieee80211_local *local,
might_sleep();
+ if (!sdata)
+ return -EIO;
+
sdata = get_bss_sdata(sdata);
if (!check_sdata_in_driver(sdata))
return -EIO;
--
2.35.3