linux-kernel - Re: [syzbot] [wireless?] UBSAN: array-index-out-of-bounds in ieee80211_rx_mgmt

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Message-ID: <tencent_B943771D66763DE13764960E36124B6C7509@qq.com>
Date: Tue, 17 Jun 2025 10:15:39 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+6554b492c7008bcd3385@...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_rx_mgmt_beacon

#syz test

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 2d46d4af60d7..c370352b7d7d 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -7222,7 +7222,7 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_link_data *link,
 	if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
 		struct ieee80211_ext *ext = (void *) mgmt;
 		variable = ext->u.s1g_beacon.variable +
-			   ieee80211_s1g_optional_len(ext->frame_control);
+			   (ieee80211_s1g_optional_len(ext->frame_control) - 1);
 	}
 
 	baselen = (u8 *) variable - (u8 *) mgmt;