linux-kernel - [PATCH] evm: Move two error code assignments in evm_set

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Date:   Tue, 24 Jan 2017 19:44:45 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-ima-devel@...ts.sourceforge.net,
        linux-security-module@...r.kernel.org,
        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] evm: Move two error code assignments in evm_set_key()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Tue, 24 Jan 2017 19:37:20 +0100

A local variable was set to an error code in two cases before a concrete
error situation was detected. Thus move the corresponding assignments into
if branches to indicate a software failure there.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 security/integrity/evm/evm_crypto.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/security/integrity/evm/evm_crypto.c b/security/integrity/evm/evm_crypto.c
index d7f282d75cc1..71bc204e2ee8 100644
--- a/security/integrity/evm/evm_crypto.c
+++ b/security/integrity/evm/evm_crypto.c
@@ -53,12 +53,14 @@ int evm_set_key(void *key, size_t keylen)
 {
 	int rc;
 
-	rc = -EBUSY;
-	if (test_and_set_bit(EVM_SET_KEY_BUSY, &evm_set_key_flags))
+	if (test_and_set_bit(EVM_SET_KEY_BUSY, &evm_set_key_flags)) {
+		rc = -EBUSY;
 		goto busy;
-	rc = -EINVAL;
-	if (keylen > MAX_KEY_SIZE)
+	}
+	if (keylen > MAX_KEY_SIZE) {
+		rc = -EINVAL;
 		goto inval;
+	}
 	memcpy(evmkey, key, keylen);
 	evm_initialized |= EVM_INIT_HMAC;
 	pr_info("key initialized\n");
-- 
2.11.0