[CRIU] [PATCH] cgroup: don't overwrite the offset value in a loop

[Pavel Emelyanov]

On 08/15/2014 04:03 PM, Andrew Vagin wrote:
> prepare_cgroup_dirs() gets a path and an offset.
> Then we add substrings to the source string and handle them.

The same place exists in prepare_cgroup_dir_properties().
Can we also add the 2nd empty cgroup into cgroup01 test
to catch such things in the future?

> Cc: Tycho Andersen <tycho.andersen at canonical.com>
> Signed-off-by: Andrew Vagin <avagin at openvz.org>
> ---
>  cgroup.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/cgroup.c b/cgroup.c
> index 1d297e6..e277657 100644
> --- a/cgroup.c
> +++ b/cgroup.c
> @@ -1023,9 +1023,10 @@ static int prepare_cgroup_dirs(char *paux, size_t off, CgroupDirEntry **ents, si
>  	CgroupDirEntry *e;
>  
>  	for (i = 0; i < n_ents; i++) {
> +		size_t off2 = off;
>  		e = ents[i];
>  
> -		off += sprintf(paux + off, "/%s", e->dir_name);
> +		off2 += sprintf(paux + off, "/%s", e->dir_name);
>  
>  		/*
>  		 * Checking to see if file already exists. If not, create it. If
> @@ -1047,7 +1048,7 @@ static int prepare_cgroup_dirs(char *paux, size_t off, CgroupDirEntry **ents, si
>  			pr_info("Determined dir %s already existed\n", paux);
>  		}
>  
> -		if (prepare_cgroup_dirs(paux, off, e->children, e->n_children) < 0)
> +		if (prepare_cgroup_dirs(paux, off2, e->children, e->n_children) < 0)
>  			return -1;
>  	}
>  
>