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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        syzbot+405843667e93b9790fc1@syzkaller.appspotmail.com,
        Du Cheng <ducheng2@gmail.com>,
        Johannes Berg <johannes.berg@intel.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.12 015/178] mac80211: fix skb length check in ieee80211_scan_rx()
Date:   Mon, 21 Jun 2021 18:13:49 +0200
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From: Du Cheng <ducheng2@gmail.com>

[ Upstream commit e298aa358f0ca658406d524b6639fe389cb6e11e ]

Replace hard-coded compile-time constants for header length check
with dynamic determination based on the frame type. Otherwise, we
hit a validation WARN_ON in cfg80211 later.

Fixes: cd418ba63f0c ("mac80211: convert S1G beacon to scan results")
Reported-by: syzbot+405843667e93b9790fc1@syzkaller.appspotmail.com
Signed-off-by: Du Cheng <ducheng2@gmail.com>
Link: https://lore.kernel.org/r/20210510041649.589754-1-ducheng2@gmail.com
[style fixes, reword commit message]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/mac80211/scan.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index d4cc9ac2d703..6b50cb5e0e3c 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -251,13 +251,24 @@ void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
 	struct ieee80211_mgmt *mgmt = (void *)skb->data;
 	struct ieee80211_bss *bss;
 	struct ieee80211_channel *channel;
+	size_t min_hdr_len = offsetof(struct ieee80211_mgmt,
+				      u.probe_resp.variable);
+
+	if (!ieee80211_is_probe_resp(mgmt->frame_control) &&
+	    !ieee80211_is_beacon(mgmt->frame_control) &&
+	    !ieee80211_is_s1g_beacon(mgmt->frame_control))
+		return;
 
 	if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
-		if (skb->len < 15)
-			return;
-	} else if (skb->len < 24 ||
-		 (!ieee80211_is_probe_resp(mgmt->frame_control) &&
-		  !ieee80211_is_beacon(mgmt->frame_control)))
+		if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
+			min_hdr_len = offsetof(struct ieee80211_ext,
+					       u.s1g_short_beacon.variable);
+		else
+			min_hdr_len = offsetof(struct ieee80211_ext,
+					       u.s1g_beacon);
+	}
+
+	if (skb->len < min_hdr_len)
 		return;
 
 	sdata1 = rcu_dereference(local->scan_sdata);
-- 
2.30.2