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| author | Miklos Szeredi <mszeredi@suse.cz> | 2013-07-17 14:53:53 +0200 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@suse.cz> | 2013-07-17 14:53:53 +0200 |
| commit | a28ef45cbb1e7fadd5159deb17b02de15c6e4aaf (patch) | |
| tree | e8d90f874259b6fc442b38eafdb59b7106b42934 /fs/fuse | |
| parent | 53ce9a3364de0723b27d861de93bfc882f7db050 (diff) | |
| download | lwn-a28ef45cbb1e7fadd5159deb17b02de15c6e4aaf.tar.gz lwn-a28ef45cbb1e7fadd5159deb17b02de15c6e4aaf.zip | |
fuse: readdirplus: sanity checks
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
Diffstat (limited to 'fs/fuse')
| -rw-r--r-- | fs/fuse/dir.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index 2ae5308174e2..bb6829720dd6 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -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); |