linux-kernel - Re: [PATCH] misc: fastrpc: fix memory leak

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Date:   Wed, 29 Apr 2020 22:02:59 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     gregkh@...uxfoundation.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, arnd@...db.de
Subject: Re: [PATCH] misc: fastrpc: fix memory leak

On Wed 29 Apr 08:29 PDT 2020, Srinivas Kandagatla wrote:

> if misc_register() fails, previously allocated data is left without freeing,
> this could result in memory leak.

s/could/will/

> 
> So fix it!
> 

As Markus pointed out, a Fixes: tag would be in order to make sure this
is backported properly.


PS: although unlikely, if of_platform_populate() where to fail we're
leaking both the contet and the misc device.

Regards,
Bjorn

> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>  drivers/misc/fastrpc.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
> index e3e085e33d46..9065d3e71ff7 100644
> --- a/drivers/misc/fastrpc.c
> +++ b/drivers/misc/fastrpc.c
> @@ -1613,8 +1613,10 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
>  					    domains[domain_id]);
>  	data->miscdev.fops = &fastrpc_fops;
>  	err = misc_register(&data->miscdev);
> -	if (err)
> +	if (err) {
> +		kfree(data);
>  		return err;
> +	}
>  
>  	kref_init(&data->refcount);
>  
> -- 
> 2.21.0
>