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Date:   Tue, 22 Dec 2020 21:24:05 -0500
From:   Sasha Levin <>
Cc:     Zhang Xiaohui <>,
        Kalle Valo <>,
        Sasha Levin <>,,
Subject: [PATCH AUTOSEL 4.9 37/48] mwifiex: Fix possible buffer overflows in mwifiex_cmd_802_11_ad_hoc_start

From: Zhang Xiaohui <>

[ Upstream commit 5c455c5ab332773464d02ba17015acdca198f03d ]

mwifiex_cmd_802_11_ad_hoc_start() calls memcpy() without checking
the destination size may trigger a buffer overflower,
which a local user could use to cause denial of service
or the execution of arbitrary code.
Fix it by putting the length check before calling memcpy().

Signed-off-by: Zhang Xiaohui <>
Signed-off-by: Kalle Valo <>
Signed-off-by: Sasha Levin <>
 drivers/net/wireless/marvell/mwifiex/join.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/wireless/marvell/mwifiex/join.c b/drivers/net/wireless/marvell/mwifiex/join.c
index b89596c18b41a..313b5d9fd08ed 100644
--- a/drivers/net/wireless/marvell/mwifiex/join.c
+++ b/drivers/net/wireless/marvell/mwifiex/join.c
@@ -877,6 +877,8 @@ mwifiex_cmd_802_11_ad_hoc_start(struct mwifiex_private *priv,
 	memset(adhoc_start->ssid, 0, IEEE80211_MAX_SSID_LEN);
+	if (req_ssid->ssid_len > IEEE80211_MAX_SSID_LEN)
+		req_ssid->ssid_len = IEEE80211_MAX_SSID_LEN;
 	memcpy(adhoc_start->ssid, req_ssid->ssid, req_ssid->ssid_len);
 	mwifiex_dbg(adapter, INFO, "info: ADHOC_S_CMD: SSID = %s\n",

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