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-rw-r--r--security/keys/keyring.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index 8ec02746ca9..e814d2109f8 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -151,7 +151,9 @@ static void keyring_destroy(struct key *keyring)
write_unlock(&keyring_name_lock);
}
- klist = rcu_dereference(keyring->payload.subscriptions);
+ klist = rcu_dereference_check(keyring->payload.subscriptions,
+ rcu_read_lock_held() ||
+ atomic_read(&keyring->usage) == 0);
if (klist) {
for (loop = klist->nkeys - 1; loop >= 0; loop--)
key_put(klist->keys[loop]);