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wifi: mac80211: don't RCU-dereference the mesh CSA settings we just set

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In the error path of ieee80211_mesh_csa_beacon() the settings that were
just assigned are read back with rcu_dereference(), which lockdep then
complains about.

There's no need to read the pointer at all, tmp_csa_settings still is
the right value anyway.

Assisted-by: LLM
Fixes: b8456a14e9 ("{nl,cfg,mac}80211: implement mesh channel switch userspace API")
Reported-by: syzbot+b59873f5699e941717ca@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=b59873f5699e941717ca
Link: https://patch.msgid.link/20260908122838.201719-17-johannes@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2026-09-08 14:28:16 +02:00
parent 370872d303
commit b481e64e44
1 changed files with 0 additions and 1 deletions
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1
net/mac80211/mesh.c
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@ -1559,7 +1559,6 @@ int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
ret = ieee80211_mesh_rebuild_beacon(sdata);
if (ret) {
tmp_csa_settings = rcu_dereference(ifmsh->csa);
RCU_INIT_POINTER(ifmsh->csa, NULL);
kfree_rcu(tmp_csa_settings, rcu_head);
return ret;