wifi: mac80211: mesh: release the channel if start fails

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ieee80211_join_mesh() acquires a channel context and then calls
ieee80211_start_mesh(), which can fail. In that case, the chanctx
isn't released then interface removal will attempt to unassign it
after it's removed from the driver, hitting:

  wlan0: Failed check-sdata-in-driver check, flags: 0x0
  WARNING: net/mac80211/driver-ops.c:366 at drv_unassign_vif_chanctx
   ieee80211_assign_link_chanctx
   __ieee80211_link_release_channel
   ieee80211_link_release_channel
   ieee80211_teardown_sdata
   unregister_netdevice_many_notify
   _cfg80211_unregister_wdev
   ieee80211_remove_interfaces
   ieee80211_unregister_hw
   mac80211_hwsim_del_radio
   hwsim_exit_net

Correctly release the channel on start failures.

Assisted-by: LLM
Reported-by: syzbot+63a84ea9c0f57d6133fa@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=63a84ea9c0f57d6133fa
Fixes: 2b5e196775 ("mac80211: cache mesh beacon")
Link: https://patch.msgid.link/20260908122838.201719-21-johannes@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

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This commit is contained in:

Johannes Berg 2026-09-08 14:28:20 +02:00

parent 860134b3af

commit ae97fff649

1 changed files with 5 additions and 1 deletions

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6

net/mac80211/cfg.c

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