linux-kernel - Re: [PATCH] staging: mmal-vchiq: add a check for the return of vmalloc()

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Date:   Tue, 15 Mar 2022 15:21:30 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     xkernel.wang@...mail.com
Cc:     nsaenz@...nel.org, bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: mmal-vchiq: add a check for the return of
 vmalloc()

On Fri, Mar 04, 2022 at 04:17:41PM +0800, xkernel.wang@...mail.com wrote:
> From: Xiaoke Wang <xkernel.wang@...mail.com>
> 
> vmalloc() is a memory allocation API which can return NULL when some
> internal memory errors happen. So it is better to check the return
> value of it to catch the error in time.
> 
> Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
> ---
>  drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
> index 76d3f03..1bbd301 100644
> --- a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
> +++ b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
> @@ -1909,6 +1909,11 @@ int vchiq_mmal_init(struct vchiq_mmal_instance **out_instance)
>  	mutex_init(&instance->vchiq_mutex);
>  
>  	instance->bulk_scratch = vmalloc(PAGE_SIZE);
> +	if (!instance->bulk_scratch) {
> +		err = -ENOMEM;
> +		kfree(instance);

This is called in the error section, please just jump to the proper
location and then this line will not be needed.

thanks,

greg k-h