netdev - Re: [PATCH v11 bpf-next 02/17] bpf: add BPF token delegation mount options to BPF FS

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Date: Thu, 30 Nov 2023 16:36:55 +0000
From: Simon Horman <horms@...nel.org>
To: Andrii Nakryiko <andrii@...nel.org>
Cc: bpf@...r.kernel.org, netdev@...r.kernel.org, paul@...l-moore.com,
	brauner@...nel.org, linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org, keescook@...omium.org,
	kernel-team@...a.com, sargun@...gun.me
Subject: Re: [PATCH v11 bpf-next 02/17] bpf: add BPF token delegation mount
 options to BPF FS

On Mon, Nov 27, 2023 at 11:03:54AM -0800, Andrii Nakryiko wrote:

...

> @@ -764,7 +817,10 @@ static int bpf_get_tree(struct fs_context *fc)
>  
>  static void bpf_free_fc(struct fs_context *fc)
>  {
> -	kfree(fc->fs_private);
> +	struct bpf_mount_opts *opts = fc->s_fs_info;
> +
> +	if (opts)
> +		kfree(opts);
>  }

Hi Andrii,

as it looks like there will be a v12, I have a minor nit to report: There
is no need to check if opts is non-NULL because kfree() is basically a
no-op if it's argument is NULL.

So perhaps this can become (completely untested!):

static void bpf_free_fc(struct fs_context *fc)
{
	kfree(fc->s_fs_info);
}

...