linux-kernel - Re: [syzbot] [wireless?] UBSAN: array-index-out-of-bounds in ieee80211_request_ibss

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Message-ID: <tencent_001BC04BE01B3C2563BAA0BB1633DF9E7908@qq.com>
Date: Wed, 30 Apr 2025 18:13:16 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+4bcdddd48bb6f0be0da1@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [wireless?] UBSAN: array-index-out-of-bounds in ieee80211_request_ibss_scan

#syz test

diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index 4246d168374f..1048a05fec5e 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -1732,6 +1732,9 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
 		return -EOPNOTSUPP;
 	}
 
+	if (local->int_scan_req && !local->int_scan_req->n_channels)
+		return -EINVAL;
+
 	ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
 					    &params->chandef,
 					    sdata->wdev.iftype);