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* [PATCH] KEYS: trusted: Fix memory leak on object td
@ 2021-04-30 11:37 Colin King
  2021-05-01  0:02 ` Nick Desaulniers
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Colin King @ 2021-04-30 11:37 UTC (permalink / raw)
  To: James Bottomley, Jarkko Sakkinen, Mimi Zohar, David Howells,
	James Morris, Serge E . Hallyn, Nathan Chancellor,
	Nick Desaulniers, linux-integrity, keyrings,
	linux-security-module, linux-kernel
  Cc: kernel-janitors, clang-built-linux

From: Colin Ian King <colin.king@canonical.com>

Two error return paths are neglecting to free allocated object td,
causing a memory leak. Fix this by returning via the error return
path that securely kfree's td.

Fixes clang scan-build warning:
security/keys/trusted-keys/trusted_tpm1.c:496:10: warning: Potential
memory leak [unix.Malloc]

Fixes: 5df16caada3f ("KEYS: trusted: Fix incorrect handling of tpm_get_random()")
Signed-off-by: Colin Ian King <colin.king@canonical.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);
-- 
2.30.2


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2021-04-30 11:37 [PATCH] KEYS: trusted: Fix memory leak on object td Colin King
2021-05-01  0:02 ` Nick Desaulniers
2021-05-03 14:53 ` Jarkko Sakkinen
2021-05-03 14:55 ` Jarkko Sakkinen

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