Quoting Dan Carpenter (error27@xxxxxxxxx):
> The original code didn't leave enough space for a NULL terminator.
> These strings are copied with strcpy() into fixed length buffers in
> cgroup_root_from_opts().
>
> Signed-off-by: Dan Carpenter <error27@xxxxxxxxx>
Hmm, yes - the fact that kstrndup() allocs len+1 probably threw off
the author of these original lines. Thanks for spotting this!
Acked-by: Serge E. Hallyn <serge@xxxxxxxxxx>
> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> index 3ac6f5b..a942820 100644
> --- a/kernel/cgroup.c
> +++ b/kernel/cgroup.c
> @@ -1102,7 +1102,7 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
> if (opts->release_agent)
> return -EINVAL;
> opts->release_agent =
> - kstrndup(token + 14, PATH_MAX, GFP_KERNEL);
> + kstrndup(token + 14, PATH_MAX - 1, GFP_KERNEL);
> if (!opts->release_agent)
> return -ENOMEM;
> } else if (!strncmp(token, "name=", 5)) {
> @@ -1123,7 +1123,7 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
> if (opts->name)
> return -EINVAL;
> opts->name = kstrndup(name,
> - MAX_CGROUP_ROOT_NAMELEN,
> + MAX_CGROUP_ROOT_NAMELEN - 1,
> GFP_KERNEL);
> if (!opts->name)
> return -ENOMEM;
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