Re: [PATCH] KEYS: trusted: fix memory leak

On 4/30/21 12:50 PM, Ben Boeckel wrote:

On Fri, Apr 30, 2021 at 11:58:10 -0700, trix@redhat.com wrote:

quoted

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);

I see this patch also submitted by Colin (Cc'd) in Message-Id:

     [ref]

Let's use Colin's.

Tom

To my eyes, the commit message seems a bit better over there.

--Ben