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rEv/QjdgOY95Ato486ezURt8BeGYWb3+lBaYolTRJ4DcrD/BWKOrUqivpqhzGSsT6JvRBQ1HRSX j24olS57qouAPT2CMl0snGlab5ANmS8V1QtZvrcCGvoldooPmIjoq8QFs8ypCVedXaDLHAvXtgK a/SzODuc8xbLAppdZTpk0VhD9Ub+/rS1+7PFY8d0swroZrfe9pcTICCOTwTq93eGDeCkNtnxw/g ubxgTpa/hsHKssXgv/I/DDvmTw2F3CQyRG07amkhN5kUe7x/SAK4/ha/EPLq82BkLoOLQ/eeHKT B3xZx407AGTX3uYA2sA== Hi Greg/Sasha, On 30/09/26 8:55 pm, Greg Kroah-Hartman wrote: > 5.15-stable review patch. If anyone has any objections, please let me know. > > ------------------ > > From: Johannes Berg > > [ Upstream commit b377e1000d963e7182a987082b4b06580bd7ac84 ] > > When an assoc AP switches to a channel that already has a BSS entry, > cfg80211_update_assoc_bss_entry() removes that entry before rehashing > the real one, since the two would otherwise collide in the BSS rbtree. > > The lookup for that entry also required it to match the connection's BSS > type, so an entry advertising e.g. the IBSS capability bit was left in > place, and the following cfg80211_rehash_bss() then ran into it: > > WARN_ON(!cmp) > > Changing the type shouldn't really happen, but can be triggered by a > rogue AP/device, so drop the check and remove any entries matching > the comparison. > > Assisted-by: LLM > Fixes: 0afd425b1b64 ("cfg80211: fix duplicated scan entries after channel switch") > Reported-by: syzbot+dc6f4dce0d707900cdea@syzkaller.appspotmail.com > Closes: https://syzkaller.appspot.com/bug?extid=dc6f4dce0d707900cdea > Link: https://patch.msgid.link/20260904165614.1f05dae1c546.Ib52d57b57caa912efee020f9d4a033a5160617ce@changeid > Signed-off-by: Johannes Berg > Signed-off-by: Sasha Levin > --- > net/wireless/scan.c | 5 ----- > 1 file changed, 5 deletions(-) > > diff --git a/net/wireless/scan.c b/net/wireless/scan.c > index de1e89f471a17..5063f43cceda7 100644 > --- a/net/wireless/scan.c > +++ b/net/wireless/scan.c > @@ -2745,11 +2745,6 @@ void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev, > cbss->pub.channel = chan; > > list_for_each_entry(bss, &rdev->bss_list, list) { > - if (!cfg80211_bss_type_match(bss->pub.capability, > - bss->pub.channel->band, > - wdev->conn_bss_type)) > - continue; An AI-assisted review flagged the stale-BSS selection change, and I checked the caller, merge helper and final-reference cleanup at the final 5.15.y tip. The filter deletion is exact, but the caller still uses the older IE ownership rule. Upstream ownership handling (b377e1000d96, net/wireless/scan.c:3514): if (new) { /* to save time, update IEs for transmitting bss only */ cfg80211_update_known_bss(rdev, cbss, new, false); new->pub.proberesp_ies = NULL; new->pub.beacon_ies = NULL; 5.15.y ownership handling (d7aa8488b4a2, net/wireless/scan.c:2757): if (new) { /* to save time, update IEs for transmitting bss only */ if (cfg80211_update_known_bss(rdev, cbss, new, false)) { new->pub.proberesp_ies = NULL; new->pub.beacon_ies = NULL; } The merge helper can consume beacon_ies and return false, leaving new's pointer uncleared. Unlinking and freeing that cached entry can then queue the same IE for disposal again. Before this patch, the caller skipped capability-mismatched entries; deleting that filter now admits those entries to the failing merge/unlink path. The older ownership bug therefore gains an additional double-disposal case. I think 5.15.y needs acc44cbd7727115f9381c35c2898b1b5af665ec8 ("wifi: cfg80211: avoid double free if updating BSS fails") before this selection change, clearing both IE pointers regardless of the helper's return value, thoughts? thanks, Harshit > - > if (bss == cbss) > continue; >