From 05050a2bc0c1599e95ef15a6ae34cb68ceabb06a Mon Sep 17 00:00:00 2001 From: Anjaneyulu Date: Fri, 16 Jun 2023 09:53:56 +0300 Subject: [PATCH] wifi: mac80211: add consistency check for compat chandef Add NULL check for compat variable to avoid crash in cfg80211_chandef_compatible() if it got called with some mixed up channel context where not all the users compatible with each other, which shouldn't happen. Signed-off-by: Anjaneyulu Signed-off-by: Gregory Greenman Link: https://lore.kernel.org/r/20230616094948.ae0f10dfd36b.Iea98c74aeb87bf6ef49f6d0c8687bba0dbea2abd@changeid Signed-off-by: Johannes Berg --- net/mac80211/chan.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c index 168bf3edd4b4..68952752b599 100644 --- a/net/mac80211/chan.c +++ b/net/mac80211/chan.c @@ -802,6 +802,11 @@ void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local, } } + if (WARN_ON_ONCE(!compat)) { + rcu_read_unlock(); + return; + } + /* TDLS peers can sometimes affect the chandef width */ list_for_each_entry_rcu(sta, &local->sta_list, list) { if (!sta->uploaded ||