The patch titled
cgroups: fix possible use after free
has been added to the -mm tree. Its filename is
cgroups-fix-possible-use-after-free.patch
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------------------------------------------------------
Subject: cgroups: fix possible use after free
From: Li Zefan <lizf@xxxxxxxxxxxxxx>
In cgroup_kill_sb(), root is freed before sb is detached from the list, so
another sget() may find this sb and call cgroup_test_super(), which will
access the root that has been freed.
Reported-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
Acked-by: Paul Menage <menage@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/cgroup.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/cgroup.c~cgroups-fix-possible-use-after-free kernel/cgroup.c
--- a/kernel/cgroup.c~cgroups-fix-possible-use-after-free
+++ a/kernel/cgroup.c
@@ -1123,8 +1123,8 @@ static void cgroup_kill_sb(struct super_
mutex_unlock(&cgroup_mutex);
- kfree(root);
kill_litter_super(sb);
+ kfree(root);
}
static struct file_system_type cgroup_fs_type = {
_
Patches currently in -mm which might be from lizf@xxxxxxxxxxxxxx are
cgroups-add-li-zefan-as-a-maintainer.patch
cgroups-fix-lockdep-subclasses-overflow.patch
linux-next.patch
cgroups-fix-possible-use-after-free.patch
vfs-add-missing-unlock-in-sget.patch
relax-ns_can_attach-checks-to-allow-attaching-to-grandchild-cgroups.patch
cgroup-css-id-support.patch
cgroup-fix-frequent-ebusy-at-rmdir.patch
memcg-use-css-id.patch
memcg-hierarchical-stat.patch
memcg-fix-shrinking-memory-to-return-ebusy-by-fixing-retry-algorithm.patch
memcg-fix-oom-killer-under-memcg.patch
memcg-fix-oom-killer-under-memcg-fix2.patch
memcg-fix-oom-killer-under-memcg-fix.patch
memcg-show-memcg-information-during-oom.patch
memcg-show-memcg-information-during-oom-fix2.patch
memcg-show-memcg-information-during-oom-fix.patch
memcg-show-memcg-information-during-oom-fix-fix.patch
memcg-show-memcg-information-during-oom-fix-fix-checkpatch-fixes.patch
cpuset-fix-possible-races-in-cpu-memory-hotplug.patch
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