linux-kernel - [PATCH 1/1] mwifiex: Fix possible buffer overflows in mwifiex_config

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Date:   Tue,  8 Dec 2020 20:45:23 +0800
From:   Xiaohui Zhang <ruc_zhangxiaohui@....com>
To:     Xiaohui Zhang <ruc_zhangxiaohui@....com>,
        Amitkumar Karwar <amitkarwar@...il.com>,
        Ganapathi Bhat <ganapathi.bhat@....com>,
        Xinming Hu <huxinming820@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] mwifiex: Fix possible buffer overflows in mwifiex_config_scan

From: Zhang Xiaohui <ruc_zhangxiaohui@....com>

mwifiex_config_scan() 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 <ruc_zhangxiaohui@....com>
---
 drivers/net/wireless/marvell/mwifiex/scan.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/wireless/marvell/mwifiex/scan.c b/drivers/net/wireless/marvell/mwifiex/scan.c
index c2a685f63..b1d90678f 100644
--- a/drivers/net/wireless/marvell/mwifiex/scan.c
+++ b/drivers/net/wireless/marvell/mwifiex/scan.c
@@ -930,6 +930,8 @@ mwifiex_config_scan(struct mwifiex_private *priv,
 				    "DIRECT-", 7))
 				wildcard_ssid_tlv->max_ssid_length = 0xfe;
 
+			if (ssid_len > 1)
+				ssid_len = 1;
 			memcpy(wildcard_ssid_tlv->ssid,
 			       user_scan_in->ssid_list[i].ssid, ssid_len);
 
-- 
2.17.1