prctl: take mmap sem for writing to protect against others

[firefly-linux-kernel-4.4.55.git] / kernel / cgroup_freezer.c

diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index ff02a8e51bb33c1ab25a0d128858558912d82bfe..2d3df82c54f2dd84484e0b4d739551cb69861e4e 100644 (file)
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -155,10 +155,10 @@ static void freezer_css_free(struct cgroup_subsys_state *css)
  * @freezer->lock.  freezer_attach() makes the new tasks conform to the
  * current state and all following state changes can see the new tasks.
  */
-static void freezer_attach(struct cgroup_subsys_state *new_css,
-                          struct cgroup_taskset *tset)
+static void freezer_attach(struct cgroup_taskset *tset)
 {
        struct task_struct *task;
+       struct cgroup_subsys_state *new_css;
 
        mutex_lock(&freezer_mutex);
 
@@ -172,7 +172,7 @@ static void freezer_attach(struct cgroup_subsys_state *new_css,
         * current state before executing the following - !frozen tasks may
         * be visible in a FROZEN cgroup and frozen tasks in a THAWED one.
         */
-       cgroup_taskset_for_each(task, tset) {
+       cgroup_taskset_for_each(task, new_css, tset) {
                struct freezer *freezer = css_freezer(new_css);
 
                if (!(freezer->state & CGROUP_FREEZING)) {