selinux: cleanup dentry and inodes on error in selinuxfs

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@huawei.com>
[PM: tweak the subject line]
Signed-off-by: Paul Moore <paul@paul-moore.com>

diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index eb7f12a..5cc9101 100644 (file)
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -1377,13 +1377,18 @@ 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,
@@ -1598,8 +1603,10 @@ 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;
@@ -1644,8 +1651,10 @@ 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;
@@ -1745,8 +1754,10 @@ 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 */
@@ -1775,8 +1786,10 @@ 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);
@@ -1850,8 +1863,10 @@ 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;
@@ -1944,8 +1959,10 @@ 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;