linux-hardening - Re: [PATCH][next] drm/nouveau: Avoid -Wflex-array-member-not-at-end warning

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Message-ID: <ef5a8e6d-cb97-4872-901c-cf4bbec23be6@embeddedor.com>
Date: Fri, 13 Sep 2024 10:09:17 +0200
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 Karol Herbst <kherbst@...hat.com>, Lyude Paul <lyude@...hat.com>,
 Danilo Krummrich <dakr@...hat.com>, David Airlie <airlied@...il.com>,
 Daniel Vetter <daniel@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] drm/nouveau: Avoid -Wflex-array-member-not-at-end
 warning

Hi all,

Friendly ping: who can take this, please? 🙂

Thanks
-Gustavo

On 21/08/24 22:16, Gustavo A. R. Silva wrote:
> Use the `DEFINE_RAW_FLEX()` helper for an on-stack definition of
> a flexible structure where the size of the flexible-array member
> is known at compile-time, and refactor the rest of the code,
> accordingly.
> 
> So, with this, fix the following warning:
> 
> drivers/gpu/drm/nouveau/dispnv50/disp.c:779:47: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> 
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
>   drivers/gpu/drm/nouveau/dispnv50/disp.c | 20 +++++++++-----------
>   1 file changed, 9 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> index eed579a6c858..ddddc69640be 100644
> --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
> +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> @@ -774,11 +774,9 @@ nv50_hdmi_enable(struct drm_encoder *encoder, struct nouveau_crtc *nv_crtc,
>   	struct drm_hdmi_info *hdmi = &nv_connector->base.display_info.hdmi;
>   	union hdmi_infoframe infoframe = { 0 };
>   	const u8 rekey = 56; /* binary driver, and tegra, constant */
> +	DEFINE_RAW_FLEX(struct nvif_outp_infoframe_v0, args, data, 17);
> +	const u8 data_len = 17; /* same length as in DEFINE_RAW_FLEX above. */
>   	u32 max_ac_packet;
> -	struct {
> -		struct nvif_outp_infoframe_v0 infoframe;
> -		u8 data[17];
> -	} args = { 0 };
>   	int ret, size;
>   
>   	max_ac_packet  = mode->htotal - mode->hdisplay;
> @@ -815,29 +813,29 @@ nv50_hdmi_enable(struct drm_encoder *encoder, struct nouveau_crtc *nv_crtc,
>   		return;
>   
>   	/* AVI InfoFrame. */
> -	args.infoframe.version = 0;
> -	args.infoframe.head = nv_crtc->index;
> +	args->version = 0;
> +	args->head = nv_crtc->index;
>   
>   	if (!drm_hdmi_avi_infoframe_from_display_mode(&infoframe.avi, &nv_connector->base, mode)) {
>   		drm_hdmi_avi_infoframe_quant_range(&infoframe.avi, &nv_connector->base, mode,
>   						   HDMI_QUANTIZATION_RANGE_FULL);
>   
> -		size = hdmi_infoframe_pack(&infoframe, args.data, ARRAY_SIZE(args.data));
> +		size = hdmi_infoframe_pack(&infoframe, args->data, data_len);
>   	} else {
>   		size = 0;
>   	}
>   
> -	nvif_outp_infoframe(&nv_encoder->outp, NVIF_OUTP_INFOFRAME_V0_AVI, &args.infoframe, size);
> +	nvif_outp_infoframe(&nv_encoder->outp, NVIF_OUTP_INFOFRAME_V0_AVI, args, size);
>   
>   	/* Vendor InfoFrame. */
> -	memset(&args.data, 0, sizeof(args.data));
> +	memset(args->data, 0, data_len);
>   	if (!drm_hdmi_vendor_infoframe_from_display_mode(&infoframe.vendor.hdmi,
>   							 &nv_connector->base, mode))
> -		size = hdmi_infoframe_pack(&infoframe, args.data, ARRAY_SIZE(args.data));
> +		size = hdmi_infoframe_pack(&infoframe, args->data, data_len);
>   	else
>   		size = 0;
>   
> -	nvif_outp_infoframe(&nv_encoder->outp, NVIF_OUTP_INFOFRAME_V0_VSI, &args.infoframe, size);
> +	nvif_outp_infoframe(&nv_encoder->outp, NVIF_OUTP_INFOFRAME_V0_VSI, args, size);
>   
>   	nv_encoder->hdmi.enabled = true;
>   }