openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

cgroup: set css->id to -1 during init 

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: 01e586598b ("cgroup: release css->id after css_free")
Cc: stable@vger.kernel.org # v4.0+
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2016-05-26 15:42:13 -04:00
parent b00c52dae6
commit 8fa3b8d689
1 changed files with 1 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
kernel/cgroup.c
View File

@ -5063,6 +5063,7 @@ static void init_and_link_css(struct cgroup_subsys_state *css,
memset(css, 0, sizeof(*css)); memset(css, 0, sizeof(*css));
css->cgroup = cgrp; css->cgroup = cgrp;
css->ss = ss; css->ss = ss;
css->id = -1;
INIT_LIST_HEAD(&css->sibling); INIT_LIST_HEAD(&css->sibling);
INIT_LIST_HEAD(&css->children); INIT_LIST_HEAD(&css->children);
css->serial_nr = css_serial_nr_next++; css->serial_nr = css_serial_nr_next++;