sysfs: fix namespace refcnt leak

[~andy/linux] / fs / sysfs / mount.c

diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index 6211230814fd89dcc1a0a4b0acbabe000428e5b8..3eaf5c6622eb4fafc82137bc501aac803d7952f4 100644 (file)
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -27,6 +27,7 @@ static struct dentry *sysfs_mount(struct file_system_type *fs_type,
 {
        struct dentry *root;
        void *ns;
+       bool new_sb;
 
        if (!(flags & MS_KERNMOUNT)) {
                if (!capable(CAP_SYS_ADMIN) && !fs_fully_visible(fs_type))
@@ -37,8 +38,8 @@ static struct dentry *sysfs_mount(struct file_system_type *fs_type,
        }
 
        ns = kobj_ns_grab_current(KOBJ_NS_TYPE_NET);
-       root = kernfs_mount_ns(fs_type, flags, sysfs_root, ns);
-       if (IS_ERR(root))
+       root = kernfs_mount_ns(fs_type, flags, sysfs_root, &new_sb, ns);
+       if (IS_ERR(root) || !new_sb)
                kobj_ns_drop(KOBJ_NS_TYPE_NET, ns);
        return root;
 }