linux-kernel - Re: [PATCH] wil6210: fix potential out-of-bounds read

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Date:   Mon, 15 Apr 2019 20:24:10 +0300
From:   merez@...eaurora.org
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Vladimir Kondratiev <qca_vkondrat@....qualcomm.com>,
        linux-wireless@...r.kernel.org, wil6210@....qualcomm.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-wireless-owner@...r.kernel.org
Subject: Re: [PATCH] wil6210: fix potential out-of-bounds read

On 2019-04-15 17:56, Gustavo A. R. Silva wrote:
> Notice that *rc* can evaluate to up to 5, include/linux/netdevice.h:
> 
> enum gro_result {
>         GRO_MERGED,
>         GRO_MERGED_FREE,
>         GRO_HELD,
>         GRO_NORMAL,
>         GRO_DROP,
>         GRO_CONSUMED,
> };
> typedef enum gro_result gro_result_t;
> 
> In case *rc* evaluates to 5, we end up having an out-of-bounds read
> at drivers/net/wireless/ath/wil6210/txrx.c:821:
> 
> 	wil_dbg_txrx(wil, "Rx complete %d bytes => %s\n",
> 		     len, gro_res_str[rc]);
> 
> Fix this by adding element "GRO_CONSUMED" to array gro_res_str.
> 
> Addresses-Coverity-ID: 1444666 ("Out-of-bounds read")
> Fixes: 194b482b5055 ("wil6210: Debug print GRO Rx result")
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
>  drivers/net/wireless/ath/wil6210/txrx.c | 1 +
>  1 file changed, 1 insertion(+)

Reviewed-by: Maya Erez <merez@...eaurora.org>

-- 
Maya Erez
Qualcomm Israel, Inc. on behalf of Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a 
Linux Foundation Collaborative Project