mac80211: add missing rcu_read_lock/unlock in agg-rx session timer
Fixes a lockdep warning:
===================================================
[ INFO: suspicious rcu_dereference_check() usage. ]
---------------------------------------------------
net/mac80211/agg-rx.c:148 invoked rcu_dereference_check() without protection!
other info that might help us debug this:
rcu_scheduler_active = 1, debug_locks = 1
1 lock held by arecord/11226:
#0: (&tid_agg_rx->session_timer){+.-...}, at: [<ffffffff81066bb0>] call_timer_fn+0x0/0x360
stack backtrace:
Pid: 11226, comm: arecord Not tainted 3.1.0-kml #16
Call Trace:
<IRQ> [<ffffffff81093454>] lockdep_rcu_dereference+0xa4/0xc0
[<ffffffffa02778c9>] sta_rx_agg_session_timer_expired+0xc9/0x110 [mac80211]
[<ffffffffa0277800>] ? ieee80211_process_addba_resp+0x220/0x220 [mac80211]
[<ffffffff81066c3a>] call_timer_fn+0x8a/0x360
[<ffffffff81066bb0>] ? init_timer_deferrable_key+0x30/0x30
[<ffffffff81477bb0>] ? _raw_spin_unlock_irq+0x30/0x70
[<ffffffff81067049>] run_timer_softirq+0x139/0x310
[<ffffffff81091d5e>] ? put_lock_stats.isra.25+0xe/0x40
[<ffffffff810922ac>] ? lock_release_holdtime.part.26+0xdc/0x160
[<ffffffffa0277800>] ? ieee80211_process_addba_resp+0x220/0x220 [mac80211]
[<ffffffff8105cb78>] __do_softirq+0xc8/0x3c0
[<ffffffff8108f088>] ? tick_dev_program_event+0x48/0x110
[<ffffffff8108f16f>] ? tick_program_event+0x1f/0x30
[<ffffffff81153b15>] ? putname+0x35/0x50
[<ffffffff8147a43c>] call_softirq+0x1c/0x30
[<ffffffff81004c55>] do_softirq+0xa5/0xe0
[<ffffffff8105d1ee>] irq_exit+0xae/0xe0
[<ffffffff8147ac6b>] smp_apic_timer_interrupt+0x6b/0x98
[<ffffffff81479ab3>] apic_timer_interrupt+0x73/0x80
<EOI> [<ffffffff8146aac6>] ? free_debug_processing+0x1a1/0x1d5
[<ffffffff81153b15>] ? putname+0x35/0x50
[<ffffffff8146ab2b>] __slab_free+0x31/0x2ca
[<ffffffff81477c3a>] ? _raw_spin_unlock_irqrestore+0x4a/0x90
[<ffffffff81253b8f>] ? __debug_check_no_obj_freed+0x15f/0x210
[<ffffffff81097054>] ? lock_release_nested+0x84/0xc0
[<ffffffff8113ec55>] ? kmem_cache_free+0x105/0x250
[<ffffffff81153b15>] ? putname+0x35/0x50
[<ffffffff81153b15>] ? putname+0x35/0x50
[<ffffffff8113ed8f>] kmem_cache_free+0x23f/0x250
[<ffffffff81153b15>] putname+0x35/0x50
[<ffffffff81146d8d>] do_sys_open+0x16d/0x1d0
[<ffffffff81146e10>] sys_open+0x20/0x30
[<ffffffff81478f42>] system_call_fastpath+0x16/0x1b
Reported-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c
index 26ddb69..c649188 100644
--- a/net/mac80211/agg-rx.c
+++ b/net/mac80211/agg-rx.c
@@ -145,15 +145,20 @@
struct tid_ampdu_rx *tid_rx;
unsigned long timeout;
+ rcu_read_lock();
tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[*ptid]);
- if (!tid_rx)
+ if (!tid_rx) {
+ rcu_read_unlock();
return;
+ }
timeout = tid_rx->last_rx + TU_TO_JIFFIES(tid_rx->timeout);
if (time_is_after_jiffies(timeout)) {
mod_timer(&tid_rx->session_timer, timeout);
+ rcu_read_unlock();
return;
}
+ rcu_read_unlock();
#ifdef CONFIG_MAC80211_HT_DEBUG
printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);