linux-kernel - Re: [PATCH next] media: rockchip: rkcif: fix off by one bugs

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Message-ID: <f53af05d-ac10-43d5-8563-dadafbeb2379@collabora.com>
Date: Wed, 26 Nov 2025 21:27:29 +0100
From: Michael Riesch <michael.riesch@...labora.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Mehdi Djait <mehdi.djait@...ux.intel.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Heiko Stuebner
 <heiko@...ech.de>, Sakari Ailus <sakari.ailus@...ux.intel.com>,
 Hans Verkuil <hverkuil+cisco@...nel.org>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>, linux-media@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH next] media: rockchip: rkcif: fix off by one bugs

Hi Dan,

Thanks for the patch, good catch!

On 11/19/25 09:09, Dan Carpenter wrote:
> Change these comparisons from > vs >= to avoid accessing one element
> beyond the end of the arrays.
> 
> Fixes: 1f2353f5a1af ("media: rockchip: rkcif: add support for rk3568 vicap mipi capture")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>

Reviewed-by: Michael Riesch <michael.riesch@...labora.com>

Best regards,
Michael

> ---
>  .../media/platform/rockchip/rkcif/rkcif-capture-mipi.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/media/platform/rockchip/rkcif/rkcif-capture-mipi.c b/drivers/media/platform/rockchip/rkcif/rkcif-capture-mipi.c
> index 1b81bcc067ef..a933df682acc 100644
> --- a/drivers/media/platform/rockchip/rkcif/rkcif-capture-mipi.c
> +++ b/drivers/media/platform/rockchip/rkcif/rkcif-capture-mipi.c
> @@ -489,8 +489,8 @@ static inline unsigned int rkcif_mipi_get_reg(struct rkcif_interface *interface,
>  
>  	block = interface->index - RKCIF_MIPI_BASE;
>  
> -	if (WARN_ON_ONCE(block > RKCIF_MIPI_MAX - RKCIF_MIPI_BASE) ||
> -	    WARN_ON_ONCE(index > RKCIF_MIPI_REGISTER_MAX))
> +	if (WARN_ON_ONCE(block >= RKCIF_MIPI_MAX - RKCIF_MIPI_BASE) ||
> +	    WARN_ON_ONCE(index >= RKCIF_MIPI_REGISTER_MAX))
>  		return RKCIF_REGISTER_NOTSUPPORTED;
>  
>  	offset = rkcif->match_data->mipi->blocks[block].offset;
> @@ -510,9 +510,9 @@ static inline unsigned int rkcif_mipi_id_get_reg(struct rkcif_stream *stream,
>  	block = stream->interface->index - RKCIF_MIPI_BASE;
>  	id = stream->id;
>  
> -	if (WARN_ON_ONCE(block > RKCIF_MIPI_MAX - RKCIF_MIPI_BASE) ||
> -	    WARN_ON_ONCE(id > RKCIF_ID_MAX) ||
> -	    WARN_ON_ONCE(index > RKCIF_MIPI_ID_REGISTER_MAX))
> +	if (WARN_ON_ONCE(block >= RKCIF_MIPI_MAX - RKCIF_MIPI_BASE) ||
> +	    WARN_ON_ONCE(id >= RKCIF_ID_MAX) ||
> +	    WARN_ON_ONCE(index >= RKCIF_MIPI_ID_REGISTER_MAX))
>  		return RKCIF_REGISTER_NOTSUPPORTED;
>  
>  	offset = rkcif->match_data->mipi->blocks[block].offset;