linux-kernel - [PATCH] KEYS: trusted: fix memory leak

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Date:   Fri, 30 Apr 2021 11:58:10 -0700
From:   trix@...hat.com
To:     jejb@...ux.ibm.com, jarkko@...nel.org, zohar@...ux.ibm.com,
        dhowells@...hat.com, jmorris@...ei.org, serge@...lyn.com
Cc:     linux-integrity@...r.kernel.org, keyrings@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, Tom Rix <trix@...hat.com>
Subject: [PATCH] KEYS: trusted: fix memory leak

From: Tom Rix <trix@...hat.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@...hat.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