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fuse: readdirplus: sanity checks

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Add sanity checks before adding or updating an entry with data received
from readdirplus.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
CC: stable@vger.kernel.org
This commit is contained in:
Miklos Szeredi 2013-07-17 14:53:53 +02:00
parent 53ce9a3364
commit a28ef45cbb
1 changed files with 11 additions and 1 deletions
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12
fs/fuse/dir.c
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@ -1223,6 +1223,12 @@ static int fuse_direntplus_link(struct file *file,
if (name.name[1] == '.' && name.len == 2)
return 0;
}
if (invalid_nodeid(o->nodeid))
return -EIO;
if (!fuse_valid_type(o->attr.mode))
return -EIO;
fc = get_fuse_conn(dir);
name.hash = full_name_hash(name.name, name.len);
@ -1231,10 +1237,14 @@ static int fuse_direntplus_link(struct file *file,
inode = dentry->d_inode;
if (!inode) {
d_drop(dentry);
} else if (get_node_id(inode) != o->nodeid) {
} else if (get_node_id(inode) != o->nodeid ||
((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
err = d_invalidate(dentry);
if (err)
goto out;
} else if (is_bad_inode(inode)) {
err = -EIO;
goto out;
} else {
struct fuse_inode *fi;
fi = get_fuse_inode(inode);