cgroup: cgroup_get_from_id() must check the looked-up kn is a directory
cgroup has to be one kernfs dir, otherwise kernel panic is caused, especially cgroup id is provide from userspace. Reported-by: NMarco Patalano <mpatalan@redhat.com> Fixes: 6b658c48 ("scsi: cgroup: Add cgroup_get_from_id()") Cc: Muneendra <muneendra.kumar@broadcom.com> Signed-off-by: NMing Lei <ming.lei@redhat.com> Acked-by: NMukesh Ojha <quic_mojha@quicinc.com> Cc: stable@vger.kernel.org # v5.14+ Signed-off-by: NTejun Heo <tj@kernel.org>
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