From: Al Viro <viro@zeniv.linux.org.uk>
To: Andrei Vagin <avagin@gmail.com>
Cc: David Howells <dhowells@redhat.com>,
linux-fsdevel@vger.kernel.org, cgroups@vger.kernel.org,
Li Zefan <lizefan@huawei.com>
Subject: Re: [PATCH vfs/for-next v6] cgroup: fix top cgroup refcnt leak
Date: Thu, 3 Jan 2019 08:32:29 +0000 [thread overview]
Message-ID: <20190103083229.GJ2217@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20190103035426.23526-1-avagin@gmail.com>
On Wed, Jan 02, 2019 at 07:54:26PM -0800, Andrei Vagin wrote:
[I'm thoroughly sick of refcounting in that thing, TBH ;-/]
> diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
> index a19f0fec9d82..fe67b5e81f9a 100644
> --- a/kernel/cgroup/cgroup.c
> +++ b/kernel/cgroup/cgroup.c
> @@ -2019,7 +2019,7 @@ int cgroup_do_get_tree(struct fs_context *fc)
>
> ret = kernfs_get_tree(fc);
> if (ret < 0)
> - goto out_cgrp;
> + return ret;
Why does that case avoid needing cgroup_put()? Note, BTW, that we
also have this:
/*
* Destroy a cgroup filesystem context.
*/
static void cgroup_fs_context_free(struct fs_context *fc)
{
struct cgroup_fs_context *ctx = cgroup_fc2context(fc);
kfree(ctx->name);
kfree(ctx->release_agent);
if (ctx->root)
cgroup_put(&ctx->root->cgrp);
put_cgroup_ns(ctx->ns);
kernfs_free_fs_context(fc);
kfree(ctx);
}
which also needs to be taken into account.
next prev parent reply other threads:[~2019-01-03 8:32 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-28 23:59 [PATCH] cgroup: fix top cgroup refcnt leak Andrei Vagin
2018-12-29 0:04 ` [PATCH vfs/for-next v2] " Andrei Vagin
2018-12-30 19:41 ` Andrei Vagin
2019-01-02 2:28 ` Al Viro
2019-01-02 18:14 ` [PATCH vfs/for-next v3] " Andrei Vagin
2019-01-02 19:37 ` [PATCH vfs/for-next v2] " Andrei Vagin
2019-01-02 19:37 ` [PATCH vfs/for-next v4] " Andrei Vagin
2019-01-02 20:02 ` Al Viro
2019-01-02 21:06 ` Andrei Vagin
2019-01-03 0:26 ` David Howells
2019-01-03 0:43 ` Andrei Vagin
2019-01-03 1:00 ` Andrei Vagin
2019-01-03 3:54 ` [PATCH vfs/for-next v6] " Andrei Vagin
2019-01-03 8:32 ` Al Viro [this message]
2019-01-03 17:34 ` Andrei Vagin
2019-01-03 21:54 ` David Howells
2019-01-02 22:26 ` [PATCH vfs/for-next v2] " David Howells
2019-01-02 23:06 ` Andrei Vagin
2019-01-02 23:31 ` Andrei Vagin
2019-01-03 0:33 ` David Howells
2019-01-03 13:41 ` David Howells
2019-01-03 13:42 ` David Howells
2019-01-03 15:27 ` David Howells
2019-01-03 15:44 ` David Howells
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