linux-kernel - Re: [PATCH] staging: rtl8192u: fix potential infinite loop because loop counter being too small

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Message-ID: <5DBD7B91.8040309@bfs.de>
Date:   Sat, 02 Nov 2019 13:50:25 +0100
From:   walter harms <wharms@....de>
To:     Dan Carpenter <dan.carpenter@...cle.com>
CC:     Colin King <colin.king@...onical.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        devel@...verdev.osuosl.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rtl8192u: fix potential infinite loop because
 loop counter being too small



Am 01.11.2019 15:51, schrieb Dan Carpenter:
> On Fri, Nov 01, 2019 at 02:26:04PM +0000, Colin King wrote:
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> Currently the for-loop counter i is a u8 however it is being checked
>> against a maximum value priv->ieee80211->LinkDetectInfo.SlotNum which is a
>> u16. Hence there is a potential wrap-around of counter i back to zero if
>> priv->ieee80211->LinkDetectInfo.SlotNum is greater than 255.  Fix this by
>> making i a u16.
>>
>> Addresses-Coverity: ("Infinite loop")
>> Fixes: 8fc8598e61f6 ("Staging: Added Realtek rtl8192u driver to staging")
>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>> ---
>>  drivers/staging/rtl8192u/r8192U_core.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/rtl8192u/r8192U_core.c b/drivers/staging/rtl8192u/r8192U_core.c
>> index 48f1591ed5b4..fd91b7c5ca81 100644
>> --- a/drivers/staging/rtl8192u/r8192U_core.c
>> +++ b/drivers/staging/rtl8192u/r8192U_core.c
>> @@ -3210,7 +3210,7 @@ static void rtl819x_update_rxcounts(struct r8192_priv *priv, u32 *TotalRxBcnNum,
>>  			     u32 *TotalRxDataNum)
>>  {
>>  	u16			SlotIndex;
>> -	u8			i;
>> +	u16			i;
> 
> The iterator "i" should just be an int unless we know that it needs to
> be an unsigned long long.
> 

+1

i think we can spare the 2byte. ppl expect int and will get confused (as shown here).

re,
 wh