linux-kernel - [PATCH 45/46] selinux: Use common error handling code in sidtab

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Date:   Sun, 15 Jan 2017 16:45:05 +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 45/46] selinux: Use common error handling code in
 sidtab_insert()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sun, 15 Jan 2017 13:45:45 +0100

Add a jump target so that a bit of exception handling can be better reused
at the end of this function.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 security/selinux/ss/sidtab.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/security/selinux/ss/sidtab.c b/security/selinux/ss/sidtab.c
index f6915f257486..4130f882808c 100644
--- a/security/selinux/ss/sidtab.c
+++ b/security/selinux/ss/sidtab.c
@@ -35,10 +35,8 @@ int sidtab_insert(struct sidtab *s, u32 sid, struct context *context)
 	int hvalue, rc = 0;
 	struct sidtab_node *prev, *cur, *newnode;
 
-	if (!s) {
-		rc = -ENOMEM;
-		goto out;
-	}
+	if (!s)
+		goto failure_indication;
 
 	hvalue = SIDTAB_HASH(sid);
 	prev = NULL;
@@ -54,15 +52,12 @@ int sidtab_insert(struct sidtab *s, u32 sid, struct context *context)
 	}
 
 	newnode = kmalloc(sizeof(*newnode), GFP_ATOMIC);
-	if (!newnode) {
-		rc = -ENOMEM;
-		goto out;
-	}
+	if (!newnode)
+		goto failure_indication;
 	newnode->sid = sid;
 	if (context_cpy(&newnode->context, context)) {
 		kfree(newnode);
-		rc = -ENOMEM;
-		goto out;
+		goto failure_indication;
 	}
 
 	if (prev) {
@@ -80,6 +75,9 @@ int sidtab_insert(struct sidtab *s, u32 sid, struct context *context)
 		s->next_sid = sid + 1;
 out:
 	return rc;
+failure_indication:
+	rc = -ENOMEM;
+	goto out;
 }
 
 static struct context *sidtab_search_core(struct sidtab *s, u32 sid, int force)
-- 
2.11.0