CVE-2021-46922 Information

Description

In the Linux kernel the following vulnerability has been resolved:

KEYS: trusted: Fix TPM reservation for seal/unseal

The original patch 8c657a0590de (\KEYS: trusted: Reserve TPM for seal and unseal operations) was correct on the mailing list:

https://lore.kernel.org/linux-integrity/20210128235621.127925-4-jarkko@kernel.org/

But somehow got rebased so that the tpm_try_get_ops() in tpm2_seal_trusted() got lost. This causes an imbalanced put of the TPM ops and causes oopses on TIS based hardware.

This fix puts back the lost tpm_try_get_ops()

Reference

https://git.kernel.org/stable/c/bf84ef2dd2ccdcd8f2658476d34b51455f970ce4 https://git.kernel.org/stable/c/39c8d760d44cb3fa0d67e8cd505df81cf4d80999