CVE-2021-46922

CVE-2021-46922 concerns the Linux kernel KEYS: trusted TPM reservation for seal/unseal. The patch 8c657a0590de dropped tpm_try_get_ops() in tpm2_seal_trusted() during a rebase, causing imbalanced TPM ops and oopses on TIS hardware. The fix reinstates the lost tpm_try_get_ops().