cifs: check MaxPathNameComponentLength != 0 before using it

commit f74bc7c6679200a4a83156bb89cbf6c229fe8ec0 upstream.

And fix tcon leak in error path.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: David Disseldorp <ddiss@samba.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index dd3e236..d9cbda2 100644 (file)
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -193,7 +193,8 @@ check_name(struct dentry *direntry, struct cifs_tcon *tcon)
        struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
        int i;
 
-       if (unlikely(direntry->d_name.len >
+       if (unlikely(tcon->fsAttrInfo.MaxPathNameComponentLength &&
+                    direntry->d_name.len >
                     le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength)))
                return -ENAMETOOLONG;
 
@@ -509,7 +510,7 @@ cifs_atomic_open(struct inode *inode, struct dentry *direntry,
 
        rc = check_name(direntry, tcon);
        if (rc)
-               goto out_free_xid;
+               goto out;
 
        server = tcon->ses->server;