linux-kernel - [PATCH 7/10] security/selinux/ss: Use kstrdup

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Message-ID: <Pine.LNX.4.64.1005142130140.28935@ask.diku.dk>
Date:	Fri, 14 May 2010 21:30:30 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Stephen Smalley <sds@...ho.nsa.gov>,
	James Morris <jmorris@...ei.org>,
	Eric Paris <eparis@...isplace.org>,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 7/10] security/selinux/ss: Use kstrdup

From: Julia Lawall <julia@...u.dk>

Use kstrdup when the goal of an allocation is copy a string into the
allocated region.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression from,to;
expression flag,E1,E2;
statement S;
@@

-  to = kmalloc(strlen(from) + 1,flag);
+  to = kstrdup(from, flag);
   ... when != \(from = E1 \| to = E1 \)
   if (to==NULL || ...) S
   ... when != \(from = E2 \| to = E2 \)
-  strcpy(to, from);
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 security/selinux/ss/policydb.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff -u -p a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -156,12 +156,11 @@ static int roles_init(struct policydb *p
 		rc = -EINVAL;
 		goto out_free_role;
 	}
-	key = kmalloc(strlen(OBJECT_R) + 1, GFP_KERNEL);
+	key = kstrdup(OBJECT_R, GFP_KERNEL);
 	if (!key) {
 		rc = -ENOMEM;
 		goto out_free_role;
 	}
-	strcpy(key, OBJECT_R);
 	rc = hashtab_insert(p->p_roles.table, key, role);
 	if (rc)
 		goto out_free_key;
--
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