linux-kernel - Re: [PATCH 1/2] drm/logicvc: Avoid possible overflow in layer buffer setup variables

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Message-ID: <ZVy-uuMnNktDnepS@aptenodytes>
Date:   Tue, 21 Nov 2023 15:29:14 +0100
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Maxime Ripard <mripard@...nel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH 1/2] drm/logicvc: Avoid possible overflow in layer buffer
 setup variables

Hi folks,

On Wed 25 Oct 23, 15:09, Paul Kocialkowski wrote:
> The buffer_sel, voffset and hoffset values are calculated from u32
> values and might overflow under certain conditions.
> 
> Move them to u32 definitions instead of u8/u16 to avoid the issue.

Any chance to get a quick review on this simple fixup (and the next one)?
I can certainly push them myself after that.

Thanks,

Paul

> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> Fixes: efeeaefe9be5 ("drm: Add support for the LogiCVC display controller")
> ---
>  drivers/gpu/drm/logicvc/logicvc_layer.c | 6 +++---
>  drivers/gpu/drm/logicvc/logicvc_layer.h | 6 +++---
>  2 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/logicvc/logicvc_layer.c b/drivers/gpu/drm/logicvc/logicvc_layer.c
> index 464000aea765..eea22379d042 100644
> --- a/drivers/gpu/drm/logicvc/logicvc_layer.c
> +++ b/drivers/gpu/drm/logicvc/logicvc_layer.c
> @@ -268,9 +268,9 @@ int logicvc_layer_buffer_find_setup(struct logicvc_drm *logicvc,
>  	u32 layer_stride = layer_bytespp * logicvc->config.row_stride;
>  	u32 base_offset = layer->config.base_offset * layer_stride;
>  	u32 buffer_offset = layer->config.buffer_offset * layer_stride;
> -	u8 buffer_sel = 0;
> -	u16 voffset = 0;
> -	u16 hoffset = 0;
> +	u32 buffer_sel = 0;
> +	u32 voffset = 0;
> +	u32 hoffset = 0;
>  	phys_addr_t fb_addr;
>  	u32 fb_offset;
>  	u32 gap;
> diff --git a/drivers/gpu/drm/logicvc/logicvc_layer.h b/drivers/gpu/drm/logicvc/logicvc_layer.h
> index 4a4b02e9b819..a06feeda3abf 100644
> --- a/drivers/gpu/drm/logicvc/logicvc_layer.h
> +++ b/drivers/gpu/drm/logicvc/logicvc_layer.h
> @@ -18,9 +18,9 @@
>  #define LOGICVC_LAYER_ALPHA_PIXEL		1
>  
>  struct logicvc_layer_buffer_setup {
> -	u8 buffer_sel;
> -	u16 voffset;
> -	u16 hoffset;
> +	u32 buffer_sel;
> +	u32 voffset;
> +	u32 hoffset;
>  };
>  
>  struct logicvc_layer_config {
> -- 
> 2.42.0
> 

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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