wifi: mac80211: fix stats/preemption in ieee80211_tx_control_port()

Browse source

ieee80211_tx_control_port() can be called from nl80211_tx_control_port()
in normal process context via netlink sendmsg(), where BH/preemption
is not disabled. dev_sw_netstats_tx_add() uses this_cpu_ptr() internally,
which requires preemption to be disabled, triggering a
"BUG: using smp_processor_id() in preemptible code" warning.

Fix this by moving the local_bh_disable()/local_bh_enable() section to
also cover dev_sw_netstats_tx_add() and ieee80211_tpt_led_trig_tx().

Fixes: d5a014204a ("wifi: mac80211: tx: simplify control port frame transmission")
Reported-by: syzbot+d979bd35c8a76fd1b6f5@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=d979bd35c8a76fd1b6f5
Signed-off-by: Deepanshu Kartikey <kartikey406@gmail.com>
Link: https://patch.msgid.link/20260910041047.24437-1-kartikey406@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

...

This commit is contained in:

Deepanshu Kartikey 2026-09-10 09:40:47 +05:30 • committed by Johannes Berg

parent bca17bff4e

commit aaf06d7cb6

1 changed files with 1 additions and 2 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

3

net/mac80211/tx.c

View file