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Message-Id: <20230908182046.3460968-8-sashal@kernel.org>
Date: Fri, 8 Sep 2023 14:20:42 -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 5.4 08/10] 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 f80b1d57d6c38..a21739b2f44e6 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -3367,14 +3367,15 @@ 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
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