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Commit bebd6997 authored by J. Bruce Fields's avatar J. Bruce Fields
Browse files

nfsd: initialize i_private before d_add 



A process could race in an open and attempt to read one of these files
before i_private is initialized, and get a spurious error.

Reported-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent dc46bba7

fs/nfsd/nfsctl.c

+6 −6
Original line number Diff line number Diff line
@@ -1171,13 +1171,17 @@ static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode) 
	return inode;

}



static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)

static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)

{

	struct inode *inode;



	inode = nfsd_get_inode(dir->i_sb, mode);

	if (!inode)

		return -ENOMEM;

	if (ncl) {

		inode->i_private = ncl;

		kref_get(&ncl->cl_ref);

	}

	d_add(dentry, inode);

	inc_nlink(dir);

	fsnotify_mkdir(dir, dentry);
@@ -1194,13 +1198,9 @@ static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *nc 
	dentry = d_alloc_name(parent, name);

	if (!dentry)

		goto out_err;

	ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600);

	ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);

	if (ret)

		goto out_err;

	if (ncl) {

		d_inode(dentry)->i_private = ncl;

		kref_get(&ncl->cl_ref);

	}

out:

	inode_unlock(dir);

	return dentry;