linux-kernel - [PATCH 39/46] selinux: Move two assignments for the variable "rc" in ocontext

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Date:   Sun, 15 Jan 2017 16:39:11 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-security-module@...r.kernel.org, selinux@...ho.nsa.gov,
        Eric Paris <eparis@...isplace.org>,
        James Morris <james.l.morris@...cle.com>,
        Paul Moore <paul@...l-moore.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        William Roberts <william.c.roberts@...el.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH 39/46] selinux: Move two assignments for the variable "rc" in
 ocontext_read()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sun, 15 Jan 2017 11:30:12 +0100

One 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.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 security/selinux/ss/policydb.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index 88730b372277..8b9ed3f1b132 100644
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -2121,10 +2121,11 @@ static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
 
 		l = NULL;
 		for (j = 0; j < nel; j++) {
-			rc = -ENOMEM;
 			c = kzalloc(sizeof(*c), GFP_KERNEL);
-			if (!c)
+			if (!c) {
+				rc = -ENOMEM;
 				goto out;
+			}
 			if (l)
 				l->next = c;
 			else
@@ -2186,13 +2187,13 @@ static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
 				if (rc)
 					goto out;
 
-				rc = -EINVAL;
 				c->v.behavior = le32_to_cpu(buf[0]);
 				/* Determined at runtime, not in policy DB. */
-				if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
-					goto out;
-				if (c->v.behavior > SECURITY_FS_USE_MAX)
+				if (c->v.behavior == SECURITY_FS_USE_MNTPOINT ||
+				    c->v.behavior > SECURITY_FS_USE_MAX) {
+					rc = -EINVAL;
 					goto out;
+				}
 
 				len = le32_to_cpu(buf[1]);
 				rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
-- 
2.11.0