linux-kernel - [PATCH AUTOSEL 5.15 13/15] wifi: mac80211

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Message-Id: <20230908181920.3460520-13-sashal@kernel.org>
Date:   Fri,  8 Sep 2023 14:19:16 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Johannes Berg <johannes.berg@...el.com>,
        syzbot+b2645b5bf1512b81fa22@...kaller.appspotmail.com,
        Jeff Johnson <quic_jjohnson@...cinc.com>,
        Sasha Levin <sashal@...nel.org>, kvalo@...nel.org,
        linux-wireless@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 13/15] wifi: mac80211_hwsim: drop short frames

From: Johannes Berg <johannes.berg@...el.com>

[ Upstream commit fba360a047d5eeeb9d4b7c3a9b1c8308980ce9a6 ]

While technically some control frames like ACK are shorter and
end after Address 1, such frames shouldn't be forwarded through
wmediumd or similar userspace, so require the full 3-address
header to avoid accessing invalid memory if shorter frames are
passed in.

Reported-by: syzbot+b2645b5bf1512b81fa22@...kaller.appspotmail.com
Reviewed-by: Jeff Johnson <quic_jjohnson@...cinc.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/mac80211_hwsim.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index c3c3b5aa87b0d..6eb3c845640bd 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -3693,14 +3693,15 @@ static int hwsim_cloned_frame_received_nl(struct sk_buff *skb_2,
 	frame_data_len = nla_len(info->attrs[HWSIM_ATTR_FRAME]);
 	frame_data = (void *)nla_data(info->attrs[HWSIM_ATTR_FRAME]);
 
+	if (frame_data_len < sizeof(struct ieee80211_hdr_3addr) ||
+	    frame_data_len > IEEE80211_MAX_DATA_LEN)
+		goto err;
+
 	/* Allocate new skb here */
 	skb = alloc_skb(frame_data_len, GFP_KERNEL);
 	if (skb == NULL)
 		goto err;
 
-	if (frame_data_len > IEEE80211_MAX_DATA_LEN)
-		goto err;
-
 	/* Copy the data */
 	skb_put_data(skb, frame_data, frame_data_len);
 
-- 
2.40.1