linux-kernel - [PATCH 1/1] trusted-keys: match tpm_get

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Date:   Thu, 29 Apr 2021 14:37:42 -0400
From:   Ben Boeckel <me@...boeckel.net>
To:     keyrings@...r.kernel.org
Cc:     Ben Boeckel <mathstuf@...il.com>,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH 1/1] trusted-keys: match tpm_get_ops on all return paths

From: Ben Boeckel <mathstuf@...il.com>

The `tpm_get_ops` call at the beginning of the function is not paired
with a `tpm_put_ops` on this return path.

Fixes: f2219745250f ("security: keys: trusted: use ASN.1 TPM2 key format for the blobs")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Ben Boeckel <mathstuf@...il.com>
---
 security/keys/trusted-keys/trusted_tpm2.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c
index 617fabd4d913..25c2c4d564de 100644
--- a/security/keys/trusted-keys/trusted_tpm2.c
+++ b/security/keys/trusted-keys/trusted_tpm2.c
@@ -335,8 +335,10 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
 		else
 			rc = -EPERM;
 	}
-	if (blob_len < 0)
+	if (blob_len < 0) {
+		tpm_put_ops(chip);
 		return blob_len;
+	}
 
 	payload->blob_len = blob_len;
 
-- 
2.30.2