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| author |   Miklos Szeredi <mszeredi@redhat.com> | 2016-12-16 11:02:56 +0100 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2016-12-16 11:02:56 +0100 |
| commit | 6b2d5fe46fa8f4fc1c5262c73930b9a2a94db2e3 (patch) | |
| tree | 1a4992b61001040deba77869064b265ef433f143 /fs/overlayfs/namei.c | |
| parent | ovl: split super.c (diff) | |
| download | linux-dev-6b2d5fe46fa8f4fc1c5262c73930b9a2a94db2e3.tar.xz linux-dev-6b2d5fe46fa8f4fc1c5262c73930b9a2a94db2e3.zip | |
ovl: check namelen
We already calculate f_namelen in statfs as the maximum of the name lengths
provided by the filesystems taking part in the overlay.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/namei.c')
| -rw-r--r-- | fs/overlayfs/namei.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c index f4057fcb0246..2e0b84c68ef6 100644 --- a/fs/overlayfs/namei.c +++ b/fs/overlayfs/namei.c @@ -20,7 +20,8 @@ static struct dentry *ovl_lookup_real(struct dentry *dir, dentry = lookup_one_len_unlocked(name->name, dir, name->len); if (IS_ERR(dentry)) { - if (PTR_ERR(dentry) == -ENOENT) + if (PTR_ERR(dentry) == -ENOENT || + PTR_ERR(dentry) == -ENAMETOOLONG) dentry = NULL; } else if (!dentry->d_inode) { dput(dentry); @@ -74,6 +75,7 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, { struct ovl_entry *oe; const struct cred *old_cred; + struct ovl_fs *ofs = dentry->d_sb->s_fs_info; struct ovl_entry *poe = dentry->d_parent->d_fsdata; struct path *stack = NULL; struct dentry *upperdir, *upperdentry = NULL; @@ -86,6 +88,9 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, unsigned int i; int err; + if (dentry->d_name.len > ofs->namelen) + return ERR_PTR(-ENAMETOOLONG); + old_cred = ovl_override_creds(dentry->d_sb); upperdir = ovl_upperdentry_dereference(poe); if (upperdir) { @@ -127,14 +132,9 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, this = ovl_lookup_real(lowerpath.dentry, &dentry->d_name); err = PTR_ERR(this); - if (IS_ERR(this)) { - /* - * If it's positive, then treat ENAMETOOLONG as ENOENT. - */ - if (err == -ENAMETOOLONG && (upperdentry || ctr)) - continue; + if (IS_ERR(this)) goto out_put; - } + if (!this) continue; if (ovl_is_whiteout(this)) { |