From f007d5c961448170d0ec2998b1a80eef054b6235 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Mon, 28 Nov 2005 13:44:16 -0800 Subject: [PATCH] fuse: check directory aliasing in mkdir Check the created directory inode for aliases in the mkdir() method. Signed-off-by: Miklos Szeredi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/fuse/dir.c | 26 +++++++++++++++++--------- 1 file changed, 17 insertions(+), 9 deletions(-) (limited to 'fs/fuse/dir.c') diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index c045cc7..3a47247 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -74,6 +74,19 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd) return 1; } +static int dir_alias(struct inode *inode) +{ + if (S_ISDIR(inode->i_mode)) { + /* Don't allow creating an alias to a directory */ + struct dentry *alias = d_find_alias(inode); + if (alias) { + dput(alias); + return 1; + } + } + return 0; +} + static struct dentry_operations fuse_dentry_operations = { .d_revalidate = fuse_dentry_revalidate, }; @@ -263,7 +276,7 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, fuse_put_request(fc, req); /* Don't allow userspace to do really stupid things... */ - if ((inode->i_mode ^ mode) & S_IFMT) { + if (((inode->i_mode ^ mode) & S_IFMT) || dir_alias(inode)) { iput(inode); return -EIO; } @@ -874,14 +887,9 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, err = fuse_lookup_iget(dir, entry, &inode); if (err) return ERR_PTR(err); - if (inode && S_ISDIR(inode->i_mode)) { - /* Don't allow creating an alias to a directory */ - struct dentry *alias = d_find_alias(inode); - if (alias) { - dput(alias); - iput(inode); - return ERR_PTR(-EIO); - } + if (inode && dir_alias(inode)) { + iput(inode); + return ERR_PTR(-EIO); } d_add(entry, inode); return NULL; -- cgit v1.1