wifi: cfg80211: ibss: ref BSS entry for joined event

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When the IBSS is joined, we only record the BSSID/channel in the event
and look up the BSS entry when processing it. However, that's racy,
e.g. a new scan with NL80211_SCAN_FLAG_FLUSH can remove it, causing a
warning in the event work:

  !bss
  WARNING: net/wireless/ibss.c:37 at __cfg80211_ibss_joined+0x3d3/0x440
  Workqueue: cfg80211 cfg80211_event_work
   cfg80211_process_wdev_events+0x39f/0x5b0 net/wireless/util.c:1144
   cfg80211_process_rdev_events+0xa1/0x110 net/wireless/util.c:1179
   cfg80211_event_work+0x2f/0x40 net/wireless/core.c:393

Do the lookup early (the driver is expected to only join an IBSS that
has a BSS entry) and keep a reference to it.

Assisted-by: LLM
Fixes: 667503ddcb ("cfg80211: fix locking")
Reported-by: syzbot+7f064ba1704c2466e36d@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=7f064ba1704c2466e36d
Link: https://patch.msgid.link/20260904165614.f49a213f0e49.I192bfe738750ebb5f2c4faa3019a428da64cd3ec@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

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This commit is contained in:

Johannes Berg 2026-09-04 16:55:06 +02:00

parent b377e1000d

commit 708f9d43d6

3 changed files with 23 additions and 22 deletions

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6

net/wireless/core.h

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38

net/wireless/ibss.c

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3

net/wireless/util.c

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