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Message-ID: <640fe933-078d-4bf5-815c-7db0eb8b9de4@linaro.org>
Date: Tue, 5 Nov 2024 10:51:22 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Vikash Garodia <quic_vgarodia@...cinc.com>,
Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
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 05/11/2024 08:54, Vikash Garodia wrote:
> There is a possibility that init_codecs is invoked multiple times during
> manipulated payload from video firmware. In such case, if codecs_count
> can get incremented to value more than MAX_CODEC_NUM, there can be OOB
> access. Keep a check for max accessible memory before accessing it.
>
> Cc: stable@...r.kernel.org
> Fixes: 1a73374a04e5 ("media: venus: hfi_parser: add common capability parser")
> Signed-off-by: Vikash Garodia <quic_vgarodia@...cinc.com>
> ---
> drivers/media/platform/qcom/venus/hfi_parser.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/media/platform/qcom/venus/hfi_parser.c b/drivers/media/platform/qcom/venus/hfi_parser.c
> index 3df241dc3a118bcdeb2c28a6ffdb907b644d5653..27d0172294d5154f4839e8cef172f9a619dfa305 100644
> --- a/drivers/media/platform/qcom/venus/hfi_parser.c
> +++ b/drivers/media/platform/qcom/venus/hfi_parser.c
> @@ -23,6 +23,8 @@ static void init_codecs(struct venus_core *core)
> return;
>
> for_each_set_bit(bit, &core->dec_codecs, MAX_CODEC_NUM) {
> + if (core->codecs_count >= MAX_CODEC_NUM)
> + return;
> cap = &caps[core->codecs_count++];
> cap->codec = BIT(bit);
> cap->domain = VIDC_SESSION_TYPE_DEC;
> @@ -30,6 +32,8 @@ static void init_codecs(struct venus_core *core)
> }
>
> for_each_set_bit(bit, &core->enc_codecs, MAX_CODEC_NUM) {
> + if (core->codecs_count >= MAX_CODEC_NUM)
> + return;
> 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.
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
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