linux-kernel - Re: [PATCH 2/5] remoteproc: Check for NULL firmwares in sysfs interface

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Message-ID: <20181006061403.GD12063@builder>
Date:   Fri, 5 Oct 2018 23:14:03 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Suman Anna <s-anna@...com>
Cc:     Ohad Ben-Cohen <ohad@...ery.com>,
        Loic Pallardy <loic.pallardy@...com>,
        Arnaud Pouliquen <arnaud.pouliquen@...com>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] remoteproc: Check for NULL firmwares in sysfs
 interface

On Fri 14 Sep 17:37 PDT 2018, Suman Anna wrote:

> The remoteproc framework provides a sysfs file 'firmware'
> for modifying the firmware image name from userspace. Add
> an additional check to ensure NULL firmwares are errored
> out right away, rather than getting a delayed error while
> requesting a firmware during the start of a remoteproc
> later on.
> 
> Signed-off-by: Suman Anna <s-anna@...com>

Applied.

Regards,
Bjorn

> ---
>  drivers/remoteproc/remoteproc_sysfs.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/remoteproc/remoteproc_sysfs.c b/drivers/remoteproc/remoteproc_sysfs.c
> index 2142b3ea726e..ce93f4d710f3 100644
> --- a/drivers/remoteproc/remoteproc_sysfs.c
> +++ b/drivers/remoteproc/remoteproc_sysfs.c
> @@ -49,6 +49,11 @@ static ssize_t firmware_store(struct device *dev,
>  	}
>  
>  	len = strcspn(buf, "\n");
> +	if (!len) {
> +		dev_err(dev, "can't provide a NULL firmware\n");
> +		err = -EINVAL;
> +		goto out;
> +	}
>  
>  	p = kstrndup(buf, len, GFP_KERNEL);
>  	if (!p) {
> -- 
> 2.18.0
>