linux-kernel - Re: [PATCH 2/5] misc: fastrpc: fix memory leak from miscdev->name

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Message-ID: <20190918063403.GD1636@tuxbook-pro>
Date:   Tue, 17 Sep 2019 23:34:03 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>
Cc:     gregkh@...uxfoundation.org, arnd@...db.de,
        srinivas.kandagatla@...aro.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 2/5] misc: fastrpc: fix memory leak from miscdev->name

On Fri 13 Sep 08:25 PDT 2019, Jorge Ramirez-Ortiz wrote:

> From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> 
> Fix a memory leak in miscdev->name by using devm_variant
> 
> Orignally reported by kmemleak:
>     [<ffffff80088b74d8>] kmemleak_alloc+0x50/0x84
>     [<ffffff80081e015c>] __kmalloc_track_caller+0xe8/0x168
>     [<ffffff8008371ab0>] kvasprintf+0x78/0x100
>     [<ffffff8008371c6c>] kasprintf+0x50/0x74
>     [<ffffff8008507f2c>] fastrpc_rpmsg_probe+0xd8/0x20c
>     [<ffffff80086b63b4>] rpmsg_dev_probe+0xa8/0x148
>     [<ffffff80084de50c>] really_probe+0x208/0x248
>     [<ffffff80084de2dc>] driver_probe_device+0x98/0xc0
>     [<ffffff80084dec6c>] __device_attach_driver+0x9c/0xac
>     [<ffffff80084dca8c>] bus_for_each_drv+0x60/0x8c
>     [<ffffff80084de64c>] __device_attach+0x8c/0x100
>     [<ffffff80084de6e0>] device_initial_probe+0x20/0x28
>     [<ffffff80084dcbd0>] bus_probe_device+0x34/0x7c
>     [<ffffff80084da32c>] device_add+0x420/0x498
>     [<ffffff80084da680>] device_register+0x24/0x2c
> 

Cc: stable@...r.kernel.org
Fixes: f6f9279f2bf0 ("misc: fastrpc: Add Qualcomm fastrpc basic driver model")

> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

You should append your S-o-b here, as you forwarded the patch.


Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
>  drivers/misc/fastrpc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
> index 8903388993d3..bc03500bfe60 100644
> --- a/drivers/misc/fastrpc.c
> +++ b/drivers/misc/fastrpc.c
> @@ -1599,8 +1599,8 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
>  	}
>  
>  	data->miscdev.minor = MISC_DYNAMIC_MINOR;
> -	data->miscdev.name = kasprintf(GFP_KERNEL, "fastrpc-%s",
> -				domains[domain_id]);
> +	data->miscdev.name = devm_kasprintf(rdev, GFP_KERNEL, "fastrpc-%s",
> +					    domains[domain_id]);
>  	data->miscdev.fops = &fastrpc_fops;
>  	err = misc_register(&data->miscdev);
>  	if (err)
> -- 
> 2.23.0
>