diff options
| author | Tejun Heo <tj@kernel.org> | 2016-05-26 15:42:13 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-08-10 11:49:27 +0200 |
| commit | 75d6026fd7d605a668ef532193c2bae707a4316c (patch) | |
| tree | 59acb92aad1257fb86ffc94ed9a25d50c72f8495 | |
| parent | 8f808f122f445fe1b391d1ee047dadf16437c749 (diff) | |
cgroup: set css->id to -1 during init
commit 8fa3b8d689a54d6d04ff7803c724fb7aca6ce98e upstream.
If percpu_ref initialization fails during css_create(), the free path
can end up trying to free css->id of zero. As ID 0 is unused, it
doesn't cause a critical breakage but it does trigger a warning
message. Fix it by setting css->id to -1 from init_and_link_css().
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Wenwei Tao <ww.tao0320@gmail.com>
Fixes: 01e586598b22 ("cgroup: release css->id after css_free")
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/cgroup.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 1c9d701f7a72..a3424f28aaf4 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -4793,6 +4793,7 @@ static void init_and_link_css(struct cgroup_subsys_state *css, memset(css, 0, sizeof(*css)); css->cgroup = cgrp; css->ss = ss; + css->id = -1; INIT_LIST_HEAD(&css->sibling); INIT_LIST_HEAD(&css->children); css->serial_nr = css_serial_nr_next++; |