linux-kernel - Re: [PATCH] staging: vc04_services: use snprintf instead of sprintf

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Message-ID: <92b54548-6276-29c3-01af-80136c28da0c@ideasonboard.com>
Date:   Wed, 25 Oct 2023 18:20:12 +0530
From:   Umang Jain <umang.jain@...asonboard.com>
To:     "Ricardo B. Marliere" <ricardo@...liere.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnd Bergmann <arnd@...db.de>
Cc:     bcm-kernel-feedback-list@...adcom.com,
        linux-staging@...ts.linux.dev,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Dan Carpenter <dan.carpenter@...aro.org>
Subject: Re: [PATCH] staging: vc04_services: use snprintf instead of sprintf

Hi Ricardo,

Thank you for the patch

On 10/25/23 5:56 PM, Ricardo B. Marliere wrote:
> All the occurrences of sprintf usage under vc04_services can be safely
> replaced by snprintf, so as to avoid any possible overflow.
>
> Suggested-by: Dan Carpenter <dan.carpenter@...aro.org>
> Suggested-by: Umang Jain <umang.jain@...asonboard.com>
> Signed-off-by: Ricardo B. Marliere <ricardo@...liere.net>

LGTM,

Reviewed-by: Umang Jain <umang.jain@...asonboard.com>

> ---
>   .../bcm2835-camera/bcm2835-camera.c              |  2 +-
>   .../interface/vchiq_arm/vchiq_arm.c              | 16 ++++++++--------
>   2 files changed, 9 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
> index e860fb89d42e..e6e89784d84b 100644
> --- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
> +++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
> @@ -855,7 +855,7 @@ static int vidioc_enum_input(struct file *file, void *priv,
>   		return -EINVAL;
>   
>   	inp->type = V4L2_INPUT_TYPE_CAMERA;
> -	sprintf((char *)inp->name, "Camera %u", inp->index);
> +	snprintf((char *)inp->name, sizeof(inp->name), "Camera %u", inp->index);
>   	return 0;
>   }
>   
> diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
> index de6a24304a4d..9fb8f657cc78 100644
> --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
> +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
> @@ -1451,12 +1451,12 @@ vchiq_use_internal(struct vchiq_state *state, struct vchiq_service *service,
>   	}
>   
>   	if (use_type == USE_TYPE_VCHIQ) {
> -		sprintf(entity, "VCHIQ:   ");
> +		snprintf(entity, sizeof(entity), "VCHIQ:   ");
>   		entity_uc = &arm_state->peer_use_count;
>   	} else if (service) {
> -		sprintf(entity, "%p4cc:%03d",
> -			&service->base.fourcc,
> -			service->client_id);
> +		snprintf(entity, sizeof(entity), "%p4cc:%03d",
> +			 &service->base.fourcc,
> +			 service->client_id);
>   		entity_uc = &service->service_use_count;
>   	} else {
>   		vchiq_log_error(state->dev, VCHIQ_SUSPEND, "%s null service ptr", __func__);
> @@ -1506,12 +1506,12 @@ vchiq_release_internal(struct vchiq_state *state, struct vchiq_service *service)
>   	}
>   
>   	if (service) {
> -		sprintf(entity, "%p4cc:%03d",
> -			&service->base.fourcc,
> -			service->client_id);
> +		snprintf(entity, sizeof(entity), "%p4cc:%03d",
> +			 &service->base.fourcc,
> +			 service->client_id);
>   		entity_uc = &service->service_use_count;
>   	} else {
> -		sprintf(entity, "PEER:   ");
> +		snprintf(entity, sizeof(entity), "PEER:   ");
>   		entity_uc = &arm_state->peer_use_count;
>   	}
>