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| author | Miklos Szeredi <miklos@szeredi.hu> | 2005-11-28 22:44:16 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-28 23:42:26 +0100 |
| commit | f007d5c961448170d0ec2998b1a80eef054b6235 (patch) | |
| tree | 92f1d45fe8f2663e500fee1ddc8e5ea97cbc943f /fs/fuse | |
| parent | [PATCH] shrinker->nr = LONG_MAX means deadlock for icache (diff) | |
| download | linux-f007d5c961448170d0ec2998b1a80eef054b6235.tar.xz linux-f007d5c961448170d0ec2998b1a80eef054b6235.zip | |
[PATCH] fuse: check directory aliasing in mkdir
Check the created directory inode for aliases in the mkdir() method.
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/fuse')
| -rw-r--r-- | fs/fuse/dir.c | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index c045cc70c749..3a47247a889e 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; |