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| author | Ming Lei <ming.lei@redhat.com> | 2022-09-23 13:51:19 +0200 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2022-09-23 19:18:45 +0200 |
| commit | df02452f3df069a59bc9e69c84435bf115cb6e37 (patch) | |
| tree | 4bbb542c16070918d40eb5746603739a45dce1d8 | |
| parent | cpuset: Add Waiman Long as a cpuset maintainer (diff) | |
| download | linux-df02452f3df069a59bc9e69c84435bf115cb6e37.tar.xz linux-df02452f3df069a59bc9e69c84435bf115cb6e37.zip | |
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: Marco Patalano <mpatalan@redhat.com>
Fixes: 6b658c4863c1 ("scsi: cgroup: Add cgroup_get_from_id()")
Cc: Muneendra <muneendra.kumar@broadcom.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Acked-by: Mukesh Ojha <quic_mojha@quicinc.com>
Cc: stable@vger.kernel.org # v5.14+
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to '')
| -rw-r--r-- | kernel/cgroup/cgroup.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index e4bb5d57f4d1..5f2090d051ac 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -6049,6 +6049,9 @@ struct cgroup *cgroup_get_from_id(u64 id) if (!kn) goto out; + if (kernfs_type(kn) != KERNFS_DIR) + goto put; + rcu_read_lock(); cgrp = rcu_dereference(*(void __rcu __force **)&kn->priv); @@ -6056,7 +6059,7 @@ struct cgroup *cgroup_get_from_id(u64 id) cgrp = NULL; rcu_read_unlock(); - +put: kernfs_put(kn); out: return cgrp; |