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wifi: mac80211: abort chanswitch when leaving a mesh

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The code in ieee80211_stop_mesh() leaves CSA active, but leaving
the mesh released the channel context, so the CSA finalize work
crashes:

  Oops: general protection fault, probably for non-canonical address
        0xdffffc0000000003
  KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
  RIP: 0010:ieee80211_put_srates_elem+0x42/0x640 net/mac80211/util.c:3272
  Call Trace:
   ieee80211_mesh_build_beacon+0xa83/0x1b50 net/mac80211/mesh.c:1093
   ieee80211_mesh_rebuild_beacon+0xc7/0x170 net/mac80211/mesh.c:1147
   ieee80211_mesh_finish_csa+0x131/0x210 net/mac80211/mesh.c:1542
   ieee80211_set_after_csa_beacon net/mac80211/cfg.c:4085 [inline]
   __ieee80211_csa_finalize net/mac80211/cfg.c:4133 [inline]
   ieee80211_csa_finalize+0x633/0x1150 net/mac80211/cfg.c:4155
   cfg80211_wiphy_work+0x2ab/0x450 net/wireless/core.c:438

Abort the channel switch properly.

Assisted-by: LLM
Fixes: b8456a14e9 ("{nl,cfg,mac}80211: implement mesh channel switch userspace API")
Reported-by: syzbot+81cd9dc1596563141d19@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=81cd9dc1596563141d19
Link: https://patch.msgid.link/20260904165722.d0b87eee08aa.I80550d6127e0bb26efb49a5fbe95be1aef1cd0cb@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2026-09-04 16:57:11 +02:00
parent bf29d085e0
commit ac7472a24b
1 changed files with 4 additions and 0 deletions
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4
net/mac80211/mesh.c
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@ -1204,6 +1204,10 @@ void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
netif_carrier_off(sdata->dev);
/* abort any running channel switch */
sdata->vif.bss_conf.csa_active = false;
ieee80211_vif_unblock_queues_csa(sdata);
/* flush STAs and mpaths on this iface */
sta_info_flush(sdata, -1);
ieee80211_free_keys(sdata, true);