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

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Message-ID: <tencent_7212DF0676098EEEF9EECD0C9F27D686DC06@qq.com>
Date: Tue, 29 Apr 2025 18:23:06 +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..b709864c7ceb 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -1818,6 +1818,12 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
 	sdata->deflink.needed_rx_chains = local->rx_chains;
 	sdata->control_port_over_nl80211 = params->control_port_over_nl80211;
 
+	struct ieee80211_local *local = sdata->local;
+	if (local && local->int_scan_req) {
+		printk("sd: %p, l: %p, nch: %d, %s\n", sdata, local, local->int_scan_req->n_channels, __func__);
+		if (!local->int_scan_req->n_channels)
+			return -EINVAL;
+	}
 	wiphy_work_queue(local->hw.wiphy, &sdata->work);
 
 	return 0;