4.17-stable review patch. If anyone has any objections, please let me know.
------------------ From: Tadeusz Struk <[email protected]> commit 8c81c24758ffbf17cf06c6835d361ffa57be2f0e upstream. If load context command returns with TPM2_RC_HANDLE or TPM2_RC_REFERENCE_H0 then we have use after free in line 114 and double free in 117. Fixes: 4d57856a21ed2 ("tpm2: add session handle context saving and restoring to the space code") Cc: [email protected] Signed-off-by: Tadeusz Struk <[email protected]> Reviewed-by: Jarkko Sakkinen <[email protected]> Signed-off--by: Jarkko Sakkinen <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/char/tpm/tpm2-space.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/char/tpm/tpm2-space.c +++ b/drivers/char/tpm/tpm2-space.c @@ -102,8 +102,9 @@ static int tpm2_load_context(struct tpm_ * TPM_RC_REFERENCE_H0 means the session has been * flushed outside the space */ - rc = -ENOENT; + *handle = 0; tpm_buf_destroy(&tbuf); + return -ENOENT; } else if (rc > 0) { dev_warn(&chip->dev, "%s: failed with a TPM error 0x%04X\n", __func__, rc);
