wifi: mac80211_hwsim: don't hand frames to mac80211 while stopping

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The code checks ->started for frames coming from wmediumd, but the
radio can be stopped after the check and before frame delivery,
causing mac80211 to hit the WARN_ON(!local->started).

Expand the mutex for this case and synchronise against it when the
radio is stopped to avoid being able to hit the warning with hwsim.

Drop the error print that would've complicated the error path, it
only triggers for allocation failures (already noisy) and malformed
frames anyway.

Assisted-by: LLM
Fixes: 7882513bac ("mac80211_hwsim driver support userspace frame tx/rx")
Reported-by: syzbot+b4aa2b672b18f1d4dc5f@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=b4aa2b672b18f1d4dc5f
Link: https://patch.msgid.link/20260904170140.5f69a10d606b.I4a7921d00643f69e439c7a3b221d104f66a3dcdc@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

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This commit is contained in:

Johannes Berg 2026-09-04 17:01:35 +02:00

parent 4635b1a1c1

commit 87840d4a3a

1 changed files with 24 additions and 15 deletions

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39

drivers/net/wireless/virtual/mac80211_hwsim_main.c

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