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

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Date:   Tue, 08 Dec 2020 16:29:29 +0200
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Xiaohui Zhang <ruc_zhangxiaohui@....com>
Cc:     Amitkumar Karwar <amitkarwar@...il.com>,
        Ganapathi Bhat <ganapathi.bhat@....com>,
        Xinming Hu <huxinming820@...il.com>,
        "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: Re: [PATCH 1/1] mwifiex: Fix possible buffer overflows in mwifiex_config_scan

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

> 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);

min_t()?

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