linux-kernel - Re: [PATCH] [media] atmel-isc: fix off-by-one comparison and out of bounds read issue

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Date:   Thu, 9 Mar 2017 11:57:18 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     "Wu, Songjun" <Songjun.Wu@...rochip.com>,
        Colin King <colin.king@...onical.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [media] atmel-isc: fix off-by-one comparison and out of
 bounds read issue

Hi Songjun,

On 08/03/17 03:25, Wu, Songjun wrote:
> Hi Colin,
> 
> Thank you for your comment.
> It is a bug, will be fixed in the next patch.

Do you mean that you will provide a new patch for this? Is there anything
wrong with this patch? It seems reasonable to me.

Regards,

	Hans

> 
> On 3/7/2017 22:30, Colin King wrote:
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> The are only HIST_ENTRIES worth of entries in  hist_entry however the
>> for-loop is iterating one too many times leasing to a read access off
>> the end off the array ctrls->hist_entry.  Fix this by iterating by
>> the correct number of times.
>>
>> Detected by CoverityScan, CID#1415279 ("Out-of-bounds read")
>>
>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>> ---
>>  drivers/media/platform/atmel/atmel-isc.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/media/platform/atmel/atmel-isc.c b/drivers/media/platform/atmel/atmel-isc.c
>> index b380a7d..7dacf8c 100644
>> --- a/drivers/media/platform/atmel/atmel-isc.c
>> +++ b/drivers/media/platform/atmel/atmel-isc.c
>> @@ -1298,7 +1298,7 @@ static void isc_hist_count(struct isc_device *isc)
>>      regmap_bulk_read(regmap, ISC_HIS_ENTRY, hist_entry, HIST_ENTRIES);
>>
>>      *hist_count = 0;
>> -    for (i = 0; i <= HIST_ENTRIES; i++)
>> +    for (i = 0; i < HIST_ENTRIES; i++)
>>          *hist_count += i * (*hist_entry++);
>>  }
>>
>>