reiserfs: Fix oops during mount

With suitably crafted reiserfs image and mount command reiserfs will
crash when trying to verify that XATTR_ROOT directory can be looked up
in / as that recurses back to xattr code like:

 xattr_lookup+0x24/0x280 fs/reiserfs/xattr.c:395
 reiserfs_xattr_get+0x89/0x540 fs/reiserfs/xattr.c:677
 reiserfs_get_acl+0x63/0x690 fs/reiserfs/xattr_acl.c:209
 get_acl+0x152/0x2e0 fs/posix_acl.c:141
 check_acl fs/namei.c:277 [inline]
 acl_permission_check fs/namei.c:309 [inline]
 generic_permission+0x2ba/0x550 fs/namei.c:353
 do_inode_permission fs/namei.c:398 [inline]
 inode_permission+0x234/0x4a0 fs/namei.c:463
 lookup_one_len+0xa6/0x200 fs/namei.c:2557
 reiserfs_lookup_privroot+0x85/0x1e0 fs/reiserfs/xattr.c:972
 reiserfs_fill_super+0x2b51/0x3240 fs/reiserfs/super.c:2176
 mount_bdev+0x24f/0x360 fs/super.c:1417

Fix the problem by bailing from reiserfs_xattr_get() when xattrs are not
yet initialized.

CC: stable@vger.kernel.org
Reported-by: syzbot+9b33c9b118d77ff59b6f@syzkaller.appspotmail.com
Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index 28b241c..fe63a7c 100644 (file)
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -674,6 +674,13 @@ reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer,
        if (get_inode_sd_version(inode) == STAT_DATA_V1)
                return -EOPNOTSUPP;
 
+       /*
+        * priv_root needn't be initialized during mount so allow initial
+        * lookups to succeed.
+        */
+       if (!REISERFS_SB(inode->i_sb)->priv_root)
+               return 0;
+
        dentry = xattr_lookup(inode, name, XATTR_REPLACE);
        if (IS_ERR(dentry)) {
                err = PTR_ERR(dentry);