linux-kernel - [PATCH] selinuxfs: Fix the resource leak in the failed branch of sel_make

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Date:   Sun, 5 Aug 2018 17:10:36 +0800
From:   nixiaoming <nixiaoming@...wei.com>
To:     <paul@...l-moore.com>, <sds@...ho.nsa.gov>,
        <eparis@...isplace.org>, <jmorris@...ei.org>, <serge@...lyn.com>,
        <nixiaoming@...wei.com>
CC:     <selinux@...ho.nsa.gov>, <linux-security-module@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] selinuxfs: Fix the resource leak in the failed branch of sel_make_inode

If the resource requested by d_alloc_name is not added to the linked
list through d_add, then dput needs to be called to release the
subsequent abnormal branch to avoid resource leakage.

Add missing dput to selinuxfs.c

Signed-off-by: nixiaoming <nixiaoming@...wei.com>
---
 security/selinux/selinuxfs.c | 33 +++++++++++++++++++++++++--------
 1 file changed, 25 insertions(+), 8 deletions(-)

diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index 79d3709..0b66d728 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -1365,13 +1365,18 @@ static int sel_make_bools(struct selinux_fs_info *fsi)
 
 		ret = -ENOMEM;
 		inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
-		if (!inode)
+		if (!inode) {
+			dput(dentry);
 			goto out;
+		}
 
 		ret = -ENAMETOOLONG;
 		len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
-		if (len >= PAGE_SIZE)
+		if (len >= PAGE_SIZE) {
+			dput(dentry);
+			iput(inode);
 			goto out;
+		}
 
 		isec = (struct inode_security_struct *)inode->i_security;
 		ret = security_genfs_sid(fsi->state, "selinuxfs", page,
@@ -1586,8 +1591,10 @@ static int sel_make_avc_files(struct dentry *dir)
 			return -ENOMEM;
 
 		inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
-		if (!inode)
+		if (!inode) {
+			dput(dentry);
 			return -ENOMEM;
+		}
 
 		inode->i_fop = files[i].ops;
 		inode->i_ino = ++fsi->last_ino;
@@ -1632,8 +1639,10 @@ static int sel_make_initcon_files(struct dentry *dir)
 			return -ENOMEM;
 
 		inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
-		if (!inode)
+		if (!inode) {
+			dput(dentry);
 			return -ENOMEM;
+		}
 
 		inode->i_fop = &sel_initcon_ops;
 		inode->i_ino = i|SEL_INITCON_INO_OFFSET;
@@ -1733,8 +1742,10 @@ static int sel_make_perm_files(char *objclass, int classvalue,
 
 		rc = -ENOMEM;
 		inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
-		if (!inode)
+		if (!inode) {
+			dput(dentry);
 			goto out;
+		}
 
 		inode->i_fop = &sel_perm_ops;
 		/* i+1 since perm values are 1-indexed */
@@ -1763,8 +1774,10 @@ static int sel_make_class_dir_entries(char *classname, int index,
 		return -ENOMEM;
 
 	inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
-	if (!inode)
+	if (!inode) {
+		dput(dentry);
 		return -ENOMEM;
+	}
 
 	inode->i_fop = &sel_class_ops;
 	inode->i_ino = sel_class_to_ino(index);
@@ -1838,8 +1851,10 @@ static int sel_make_policycap(struct selinux_fs_info *fsi)
 			return -ENOMEM;
 
 		inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
-		if (inode == NULL)
+		if (inode == NULL) {
+			dput(dentry);
 			return -ENOMEM;
+		}
 
 		inode->i_fop = &sel_policycap_ops;
 		inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
@@ -1932,8 +1947,10 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent)
 
 	ret = -ENOMEM;
 	inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
-	if (!inode)
+	if (!inode) {
+		dput(dentry);
 		goto err;
+	}
 
 	inode->i_ino = ++fsi->last_ino;
 	isec = (struct inode_security_struct *)inode->i_security;
-- 
2.10.1