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tpm: fix use after free in tpm2_load_context()

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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: 4d57856a21 ("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>
This commit is contained in:
Tadeusz Struk 2018-05-09 11:55:35 -07:00 • committed by Jarkko Sakkinen
parent 59f5a6b07f
commit 8c81c24758
1 changed files with 2 additions and 1 deletions
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3
drivers/char/tpm/tpm2-space.c
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@ -102,8 +102,9 @@ static int tpm2_load_context(struct tpm_chip *chip, u8 *buf,
* 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);