linux-kernel - Re: [PATCH 1/4] media: venus: hfi_parser: add check to avoid out of bound access

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Message-ID: <d39c7613-fda1-417c-a205-daddbc378bc3@linaro.org>
Date: Wed, 6 Nov 2024 10:23:26 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Vikash Garodia <quic_vgarodia@...cinc.com>,
 Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
 Mauro Carvalho Chehab <mchehab@...nel.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 1/4] media: venus: hfi_parser: add check to avoid out of
 bound access

On 06/11/2024 07:25, Vikash Garodia wrote:
>>>            cap = &caps[core->codecs_count++];
>>>            cap->codec = BIT(bit);
>>>            cap->domain = VIDC_SESSION_TYPE_ENC;
>>>
>> I don't see how codecs_count could be greater than the control, since you
>> increment by one on each loop but >= is fine too I suppose.
> Assume the payload from malicious firmware is packed like below
> HFI_PROPERTY_PARAM_CODEC_SUPPORTED
> HFI_PROPERTY_PARAM_CODEC_SUPPORTED
> HFI_PROPERTY_PARAM_CODEC_SUPPORTED
> .....
> for 32 or more instances of above type

But you do this

           cap = &caps[core->codecs_count++];

for each bit.

Anyway consider Dmitry's input re only calling this function once instead.

---
bod