linux-kernel - Re: [PATCH] lightnvm: fix memory leak

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Date:	Mon, 23 Nov 2015 16:13:39 +0100
From:	Matias Bjørling <mb@...htnvm.io>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
CC:	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH] lightnvm: fix memory leak

On 11/23/2015 11:35 AM, Sudip Mukherjee wrote:
> If copy_to_user() fails we returned error but we missed releasing
> devices.
>
> Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
> ---
>   drivers/lightnvm/core.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
> index f659e60..6688b60 100644
> --- a/drivers/lightnvm/core.c
> +++ b/drivers/lightnvm/core.c
> @@ -721,8 +721,11 @@ static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
>
>   	devices->nr_devices = i;
>
> -	if (copy_to_user(arg, devices, sizeof(struct nvm_ioctl_get_devices)))
> +	if (copy_to_user(arg, devices,
> +			 sizeof(struct nvm_ioctl_get_devices))) {
> +		kfree(devices);
>   		return -EFAULT;
> +	}
>
>   	kfree(devices);
>   	return 0;
>

Thanks Sudip, it seems like this error is in some of the others ioctl's 
as well. Do you want to send a patch with the fixes for them all?
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