[PATCH] KEYS: trusted: fix memory leak

From: trix@redhat.com
To: jejb@linux.ibm.com, jarkko@kernel.org, zohar@linux.ibm.com,
	dhowells@redhat.com, jmorris@namei.org, serge@hallyn.com
Cc: linux-integrity@vger.kernel.org, keyrings@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org, Tom Rix <trix@redhat.com>
Subject: [PATCH] KEYS: trusted: fix memory leak
Date: Fri, 30 Apr 2021 11:58:10 -0700	[thread overview]
Message-ID: <20210430185810.3331311-1-trix@redhat.com> (raw)

From: Tom Rix <trix@redhat.com>

Static analysis reports this problem
trusted-keys/trusted_tpm1.c:496:10: warning: Potential memory leak
  return ret;
         ^~~

In tpm_seal() some failure handling returns directly, without
freeing memory.

Fixes: 5df16caada3f ("KEYS: trusted: Fix incorrect handling of tpm_get_random()")
Signed-off-by: Tom Rix <trix@redhat.com>
---
 security/keys/trusted-keys/trusted_tpm1.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/security/keys/trusted-keys/trusted_tpm1.c b/security/keys/trusted-keys/trusted_tpm1.c
index 469394550801..aa108bea6739 100644
--- a/security/keys/trusted-keys/trusted_tpm1.c
+++ b/security/keys/trusted-keys/trusted_tpm1.c
@@ -493,10 +493,12 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype,
 
 	ret = tpm_get_random(chip, td->nonceodd, TPM_NONCE_SIZE);
 	if (ret < 0)
-		return ret;
+		goto out;
 
-	if (ret != TPM_NONCE_SIZE)
-		return -EIO;
+	if (ret != TPM_NONCE_SIZE) {
+		ret = -EIO;
+		goto out;
+	}
 
 	ordinal = htonl(TPM_ORD_SEAL);
 	datsize = htonl(datalen);
-- 
2.26.3

