wifi: mac80211: use safe list iteration in radar detect work

jira VULN-188783
cve CVE-2026-46166
commit-author Benjamin Berg <benjamin.berg@intel.com>
commit ac8eb3e

The call to ieee80211_dfs_cac_cancel can cause the iterated chanctx to
be freed and removed from the list. Guard against this to avoid a
slab-use-after-free error.

	Cc: stable@vger.kernel.org
Fixes: bca8bc0 ("wifi: mac80211: handle ieee80211_radar_detected() for MLO")
	Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Link: https://patch.msgid.link/20260505151539.236d63a1b736.I35dbb9e96a2d4a480be208770fdd99ba3b817b79@changeid
	Signed-off-by: Johannes Berg <johannes.berg@intel.com>
(cherry picked from commit ac8eb3e)
	Signed-off-by: CIQ Kernel Automation <ciq_kernel_automation@ciq.com>

Author: CIQ Kernel Automation

net/mac80211/util.c

@@ -3501,11 +3501,11 @@ void ieee80211_dfs_radar_detected_work(struct wiphy *wiphy,
 	struct ieee80211_local *local =
 		container_of(work, struct ieee80211_local, radar_detected_work);
 	struct cfg80211_chan_def chandef;
-	struct ieee80211_chanctx *ctx;
+	struct ieee80211_chanctx *ctx, *tmp;
 
 	lockdep_assert_wiphy(local->hw.wiphy);
 
-	list_for_each_entry(ctx, &local->chanctx_list, list) {
+	list_for_each_entry_safe(ctx, tmp, &local->chanctx_list, list) {
 		if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER)
 			continue;