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

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Message-ID: <2062ed93-5729-cb58-7708-9bde957c5ff0@embeddedor.com>
Date:   Mon, 15 Apr 2019 12:29:46 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     merez@...eaurora.org
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 4/15/19 12:24 PM, merez@...eaurora.org wrote:
> 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>
> 

Thanks, Maya.
--
Gustavo