linux-kernel - Re: [PATCH v2 4/4] venus: hfi_parser: Add check to keep the number of codecs within range

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Date:   Mon, 14 Aug 2023 15:15:28 +0100
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     Vikash Garodia <quic_vgarodia@...cinc.com>,
        stanimir.k.varbanov@...il.com, agross@...nel.org,
        andersson@...nel.org, konrad.dybcio@...aro.org, mchehab@...nel.org,
        hans.verkuil@...co.com, tfiga@...omium.org
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2 4/4] venus: hfi_parser: Add check to keep the number of
 codecs within range

On 14/08/2023 07:34, Vikash Garodia wrote:
>> We have two loops that check for up to 32 indexes per loop. Why not have a
>> capabilities index that can accommodate all 64 bits ?
> Max codecs supported can be 32, which is also a very high number. At max the
> hardware supports 5-6 codecs, including both decoder and encoder. 64 indices is
> would not be needed.
> 

But the bug you are fixing here is an overflow where we have received a 
full range 32 bit for each decode and encode.

How is the right fix not to extend the storage to the maximum possible 2 
x 32 ? Or indeed why not constrain the input data to 32/2 for each 
encode/decode path ?

The bug here is that we can copy two arrays of size X into one array of 
size X.

Please consider expanding the size of the storage array to accommodate 
the full size the protocol supports 2 x 32.

---
bod