4.14-stable review patch. If anyone has any objections, please let me know.
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From: Tadeusz Struk tadeusz.struk@intel.com
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: stable@vger.kernel.org Signed-off-by: Tadeusz Struk tadeusz.struk@intel.com Reviewed-by: Jarkko Sakkinen jarkko.sakkinen@linux.intel.com Signed-off--by: Jarkko Sakkinen jarkko.sakkinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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);