linux-kernel - [PATCH] SELinux: re. BUG memory leakage at ./security/selinux/hooks.c

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Date:	Mon, 10 Aug 2009 22:17:47 +1000 (EST)
From:	James Morris <jmorris@...ei.org>
To:	iceberg <strakh@...ras.ru>
cc:	linux-kernel@...r.kernel.org, selinux@...ho.nsa.gov,
	Eric Paris <eparis@...hat.com>,
	Stephen Smalley <sds@...ho.nsa.gov>
Subject: [PATCH] SELinux: re. BUG memory leakage at
 ./security/selinux/hooks.c

Please review.

Author: James Morris <jmorris@...ei.org>
Date:   Mon Aug 10 22:00:13 2009 +1000

    SELinux: fix memory leakage in /security/selinux/hooks.c
    
    Fix memory leakage in /security/selinux/hooks.c
    
    The buffer always needs to be freed here; we either error
    out or allocate more memory.
    
    Reported-by: iceberg <strakh@...ras.ru>
    Signed-off-by: James Morris <jmorris@...ei.org>

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 15c2a08..1e8cfc4 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1285,6 +1285,8 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
 		rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
 					   context, len);
 		if (rc == -ERANGE) {
+			kfree(context);
+
 			/* Need a larger buffer.  Query for the right size. */
 			rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
 						   NULL, 0);
@@ -1292,7 +1294,6 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
 				dput(dentry);
 				goto out_unlock;
 			}
-			kfree(context);
 			len = rc;
 			context = kmalloc(len+1, GFP_NOFS);
 			if (!context) {

-- 
James Morris
<jmorris@...ei.org>
--
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