netdev - Re: [PATCH iproute2-next] lib: fix checking of returned file handle size for cgroup

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Message-ID: <80ae9017-7a2d-bde6-318a-08cfd40e428d@gmail.com>
Date:   Sun, 5 Jul 2020 09:15:45 -0600
From:   David Ahern <dsahern@...il.com>
To:     Dmitry Yakunin <zeil@...dex-team.ru>, netdev@...r.kernel.org,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [PATCH iproute2-next] lib: fix checking of returned file handle
 size for cgroup

On 6/25/20 5:46 AM, Dmitry Yakunin wrote:
> Before this patch check is happened only in case when we try to find
> cgroup at cgroup2 mount point.
> 

needs to go to main branch with
Fixes: d5e6ee0dac64 ("ss: introduce cgroup2 cache and helper functions")

> Signed-off-by: Dmitry Yakunin <zeil@...dex-team.ru>
> ---
>  lib/fs.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/lib/fs.c b/lib/fs.c
> index e265fc0..4b90a70 100644
> --- a/lib/fs.c
> +++ b/lib/fs.c
> @@ -148,10 +148,10 @@ __u64 get_cgroup2_id(const char *path)
>  					strerror(errno));
>  			goto out;
>  		}
> -		if (fhp->handle_bytes != sizeof(__u64)) {
> -			fprintf(stderr, "Invalid size of cgroup2 ID\n");
> -			goto out;
> -		}
> +	}
> +	if (fhp->handle_bytes != sizeof(__u64)) {
> +		fprintf(stderr, "Invalid size of cgroup2 ID\n");
> +		goto out;
>  	}
>  
>  	memcpy(cg_id.bytes, fhp->f_handle, sizeof(__u64));
>