[PATCH] keys/trusted_keys: reuse TPM version in option handling

[Srish Srinivasan <ssrish@linux.ibm.com>]

Determine the TPM version once in the seal and unseal paths and reuse it
when allocating and parsing trusted key options. This avoids redundant TPM
version checks.

Signed-off-by: Srish Srinivasan <ssrish@linux.ibm.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
---
 security/keys/trusted-keys/trusted_tpm1.c | 22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

diff --git a/security/keys/trusted-keys/trusted_tpm1.c b/security/keys/trusted-keys/trusted_tpm1.c
index 3ec078ca3f97..70de4101923f 100644
--- a/security/keys/trusted-keys/trusted_tpm1.c
+++ b/security/keys/trusted-keys/trusted_tpm1.c
@@ -700,7 +700,7 @@ static const match_table_t key_tokens = {
 
 /* can have zero or more token= options */
 static int getoptions(char *c, struct trusted_key_payload *pay,
-		      struct trusted_key_options *opt)
+		      struct trusted_key_options *opt, int tpm2)
 {
 	struct trusted_key_tpm *private = opt->private;
 	substring_t args[MAX_OPT_ARGS];
@@ -712,11 +712,6 @@ static int getoptions(char *c, struct trusted_key_payload *pay,
 	unsigned long token_mask = 0;
 	unsigned int digest_len;
 	int i;
-	int tpm2;
-
-	tpm2 = tpm_is_tpm2(chip);
-	if (tpm2 < 0)
-		return tpm2;
 
 	private->hash = tpm2 ? HASH_ALGO_SHA256 : HASH_ALGO_SHA1;
 
@@ -838,15 +833,10 @@ static int getoptions(char *c, struct trusted_key_payload *pay,
 	return 0;
 }
 
-static struct trusted_key_options *trusted_options_alloc(void)
+static struct trusted_key_options *trusted_options_alloc(int tpm2)
 {
 	struct trusted_key_tpm *private;
 	struct trusted_key_options *options;
-	int tpm2;
-
-	tpm2 = tpm_is_tpm2(chip);
-	if (tpm2 < 0)
-		return NULL;
 
 	options = kzalloc_obj(*options);
 	if (options) {
@@ -877,13 +867,13 @@ static int trusted_tpm_seal(struct trusted_key_payload *p, char *datablob)
 	if (tpm2 < 0)
 		return tpm2;
 
-	options = trusted_options_alloc();
+	options = trusted_options_alloc(tpm2);
 	if (!options)
 		return -ENOMEM;
 
 	private = options->private;
 
-	ret = getoptions(datablob, p, options);
+	ret = getoptions(datablob, p, options, tpm2);
 	if (ret < 0)
 		return ret;
 	dump_options(options);
@@ -922,12 +912,12 @@ static int trusted_tpm_unseal(struct trusted_key_payload *p, char *datablob)
 	if (tpm2 < 0)
 		return tpm2;
 
-	options = trusted_options_alloc();
+	options = trusted_options_alloc(tpm2);
 	if (!options)
 		return -ENOMEM;
 	private = options->private;
 
-	ret = getoptions(datablob, p, options);
+	ret = getoptions(datablob, p, options, tpm2);
 	if (ret < 0)
 		return ret;
 	dump_options(options);
-- 
2.53.0