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wifi: cfg80211: fix use-after-free in cmp_bss()

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[ Upstream commit 26e84445f02ce6b2fe5f3e0e28ff7add77f35e08 ]

Following bss_free() quirk introduced in commit 776b358017
("cfg80211: track hidden SSID networks properly"), adjust
cfg80211_update_known_bss() to free the last beacon frame
elements only if they're not shared via the corresponding
'hidden_beacon_bss' pointer.

Reported-by: syzbot+30754ca335e6fb7e3092@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=30754ca335e6fb7e3092
Fixes: 3ab8227d3e ("cfg80211: refactor cfg80211_bss_update")
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Link: https://patch.msgid.link/20250813135236.799384-1-dmantipov@yandex.ru
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dmitry Antipov 2025-08-13 16:52:36 +03:00 • committed by Greg Kroah-Hartman
commit a8bb681e87
1 changed files with 2 additions and 1 deletions
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3
net/wireless/scan.c
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@ -1219,7 +1219,8 @@ cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
*/
f = rcu_access_pointer(new->pub.beacon_ies);
kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
if (!new->pub.hidden_beacon_bss)
kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
return false;
}