From: Jarkko Sakkinen <jarkko.sakkinen@opinsys.com>

Using -EFAULT as the tpm_ret_to_err() fallback error code causes makes it
incompatible on how trusted keys transmute TPM return codes.

Change the fallback as -EPERM in order to gain compatibility with trusted
keys. In addition, map TPM_RC_HASH to -EINVAL in order to be compatible
with tpm2_seal_trusted() return values.

Fixes: 539fbab37881 ("tpm: Mask TPM RC in tpm2_start_auth_session()")
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@opinsys.com>
---
v2:
- Split trusted_tpm2 change to a separate patch.
---
 include/linux/tpm.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index fc7df87dfb9a..51846317d662 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -453,8 +453,10 @@ static inline ssize_t tpm_ret_to_err(ssize_t ret)
 		return 0;
 	case TPM2_RC_SESSION_MEMORY:
 		return -ENOMEM;
+	case TPM2_RC_HASH:
+		return -EINVAL;
 	default:
-		return -EFAULT;
+		return -EPERM;
 	}
 }
 
-- 
2.39.5