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From: Ricardo Ribalda <ribalda@chromium.org>
To: "Bryan O'Donoghue" <bryan.odonoghue@linaro.org>
Cc: Michael Tretter <m.tretter@pengutronix.de>,
	 Pengutronix Kernel Team <kernel@pengutronix.de>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	 Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Michal Simek <michal.simek@amd.com>,
	 Andy Walls <awalls@md.metrocast.net>,
	Stanimir Varbanov <stanimir.k.varbanov@gmail.com>,
	 Vikash Garodia <quic_vgarodia@quicinc.com>,
	Bjorn Andersson <andersson@kernel.org>,
	 Konrad Dybcio <konrad.dybcio@linaro.org>,
	linux-media@vger.kernel.org,  linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	 linux-arm-msm@vger.kernel.org,
	Hans Verkuil <hverkuil-cisco@xs4all.nl>
Subject: Re: [PATCH v2 18/18] media: venus: Refactor hfi_buffer_alloc_mode_supported
Date: Wed, 22 May 2024 15:03:53 +0200	[thread overview]
Message-ID: <CANiDSCsq8AB-=y_DgPz6HF3qREv45jhqL==E3yQpWeppjuwKoQ@mail.gmail.com> (raw)
In-Reply-To: <79b2ab52-392f-40f6-8208-6e10330c0f04@linaro.org>

Hi Bryan

On Fri, 10 May 2024 at 02:09, Bryan O'Donoghue
<bryan.odonoghue@linaro.org> wrote:
>
> On 07/05/2024 17:27, Ricardo Ribalda wrote:
> > Replace the old style single element array at the end of the struct with
> > a flex array.
> >
> > The code does not allocate this structure, so the size change should not
> > be a problem.
> >
> > This fixes the following cocci warning:
> > drivers/media/platform/qcom/venus/hfi_helper.h:1233:5-9: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> >
> > Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> > ---
> >   drivers/media/platform/qcom/venus/hfi_helper.h | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/media/platform/qcom/venus/hfi_helper.h b/drivers/media/platform/qcom/venus/hfi_helper.h
> > index dee439ea4d2e..9545c964a428 100644
> > --- a/drivers/media/platform/qcom/venus/hfi_helper.h
> > +++ b/drivers/media/platform/qcom/venus/hfi_helper.h
> > @@ -1230,7 +1230,7 @@ struct hfi_interlace_format_supported {
> >   struct hfi_buffer_alloc_mode_supported {
> >       u32 buffer_type;
> >       u32 num_entries;
> > -     u32 data[1];
> > +     u32 data[];
> >   };
> >
> >   struct hfi_metadata_pass_through {
> >
>
> You have some fairly inconsistent fixes for this class.
>
> Please don't change the sizeof() any structures in your series, because
> the structure is unallocated changing the size is potentially insidious IMO.

If the array is a flex array we should convert it to a real flex
array. Abusing one element arrays is deprecated.

If the driver only accesses the first element of the array, I have
modified the code from data[1] to data, because, as you say, modifying
the struct size can have dangerous side effects.

But if the driver accesses more fields, then I have reviewed that
there are no allocations, or any calculations based on the structure
side, and convert them to a proper flex array.


Regards!
>
> data[1] -> data is perfectly fine in this case.

If you take a look at parse_alloc_mode() you will see that mode->data
is indeed an array, and it is used by the pointer type.

>
> ---
> bod



-- 
Ricardo Ribalda

      reply	other threads:[~2024-05-22 13:04 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-05-07 16:27 [PATCH v2 00/18] media: Fix the last set of coccinelle warnings Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 01/18] media: allegro: nal-hevc: Refactor nal_hevc_sub_layer_hrd_parameters Ricardo Ribalda
2024-05-08  8:53   ` Michael Tretter
2024-05-09 18:50     ` Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 02/18] media: xilinx: Refactor struct xvip_dma Ricardo Ribalda
2024-05-07 19:34   ` Laurent Pinchart
2024-05-07 16:27 ` [PATCH v2 03/18] media: dvb-frontend/mxl5xx: Refactor struct MBIN_FILE_T Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 04/18] media: dvb-frontend/mxl5xx: Use flex array for MBIN_SEGMENT_T Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 05/18] media: pci: cx18: Use flex arrays for struct cx18_scb Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 06/18] media: siano: Refactor struct sms_msg_data Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 07/18] media: siano: Remove unused structures Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 08/18] media: siano: Use flex arrays for sms_firmware Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 09/18] media: venus: Remove unused structs Ricardo Ribalda
2024-05-09 23:35   ` Bryan O'Donoghue
2024-05-09 23:55     ` Bryan O'Donoghue
2024-05-22 12:28       ` Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 10/18] media: venus: Use flex array for hfi_session_release_buffer_pkt Ricardo Ribalda
2024-05-09 23:37   ` Bryan O'Donoghue
2024-05-10  0:10     ` Bryan O'Donoghue
2024-05-22 12:54       ` Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 11/18] media: venus: Refactor struct hfi_uncompressed_plane_info Ricardo Ribalda
2024-05-09 23:38   ` Bryan O'Donoghue
2024-05-07 16:27 ` [PATCH v2 12/18] media: venus: Refactor struct hfi_session_get_property_pkt Ricardo Ribalda
2024-05-09 23:43   ` Bryan O'Donoghue
2024-05-07 16:27 ` [PATCH v2 13/18] media: venus: Refactor struct hfi_uncompressed_format_supported Ricardo Ribalda
2024-05-09 23:56   ` Bryan O'Donoghue
2024-05-07 16:27 ` [PATCH v2 14/18] media: venus: Refactor hfi_session_empty_buffer_uncompressed_plane0_pkt Ricardo Ribalda
2024-05-09 23:58   ` Bryan O'Donoghue
2024-05-07 16:27 ` [PATCH v2 15/18] media: venus: Refactor hfi_session_empty_buffer_compressed_pkt Ricardo Ribalda
2024-05-09 23:59   ` Bryan O'Donoghue
2024-05-07 16:27 ` [PATCH v2 16/18] media: venus: Refactor hfi_sys_get_property_pkt Ricardo Ribalda
2024-05-10  0:05   ` Bryan O'Donoghue
2024-05-07 16:27 ` [PATCH v2 17/18] media: venus: Refactor hfi_session_fill_buffer_pkt Ricardo Ribalda
2024-05-10  0:06   ` Bryan O'Donoghue
2024-05-07 16:27 ` [PATCH v2 18/18] media: venus: Refactor hfi_buffer_alloc_mode_supported Ricardo Ribalda
2024-05-10  0:09   ` Bryan O'Donoghue
2024-05-22 13:03     ` Ricardo Ribalda [this message]

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