linux-kernel - [PATCH 2/2] KEYS: trusted: Use common error handling code in tpm

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Message-ID: <3470e9c8-f7d8-247c-9e69-5301f71c3982@users.sourceforge.net>
Date:   Fri, 10 Nov 2017 21:30:25 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     keyrings@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        David Howells <dhowells@...hat.com>,
        James Morris <james.l.morris@...cle.com>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        "Serge E. Hallyn" <serge@...lyn.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH 2/2] KEYS: trusted: Use common error handling code in
 tpm_unseal()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Fri, 10 Nov 2017 21:15:53 +0100

* Add a jump target so that a specific error message is stored only once
  at the end of this function implementation.

* Replace two calls of the macro "pr_info" by goto statements.

* Adjust two condition checks.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 security/keys/trusted.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/security/keys/trusted.c b/security/keys/trusted.c
index fd06d0c5323b..a295eaae40ba 100644
--- a/security/keys/trusted.c
+++ b/security/keys/trusted.c
@@ -591,15 +591,12 @@ static int tpm_unseal(struct tpm_buf *tb,
 
 	/* sessions for unsealing key and data */
 	ret = oiap(tb, &authhandle1, enonce1);
-	if (ret < 0) {
-		pr_info("trusted_key: oiap failed (%d)\n", ret);
-		return ret;
-	}
+	if (ret)
+		goto report_failure;
+
 	ret = oiap(tb, &authhandle2, enonce2);
-	if (ret < 0) {
-		pr_info("trusted_key: oiap failed (%d)\n", ret);
-		return ret;
-	}
+	if (ret)
+		goto report_failure;
 
 	ordinal = htonl(TPM_ORD_UNSEAL);
 	keyhndl = htonl(SRKHANDLE);
@@ -654,6 +651,10 @@ static int tpm_unseal(struct tpm_buf *tb,
 	}
 	memcpy(data, tb->data + TPM_DATA_OFFSET + sizeof(uint32_t), *datalen);
 	return 0;
+
+report_failure:
+	pr_info("trusted_key: oiap failed (%d)\n", ret);
+	return ret;
 }
 
 /*
-- 
2.15.0