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From: Sukadev Bhattiprolu <sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
Subject: Re: BUG in tty_open when using containers and ptrace
Date: Thu, 30 Jul 2009 11:44:20 -0700
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To: Grzegorz Nosek <root-AfQBxy1nhrQ00sYp1HPQUA@public.gmane.org>
Cc: containers-qjLDD68F18O7TbgM5vRIOg@public.gmane.org, "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>, Alan Cox <alan-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org>, lxc-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
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Sukadev Bhattiprolu [sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org] wrote:
| Index: linux-2.6.30/fs/devpts/inode.c
| ===================================================================
| --- linux-2.6.30.orig/fs/devpts/inode.c 2009-07-30 10:48:17.000000000 -0400
| +++ linux-2.6.30/fs/devpts/inode.c      2009-07-30 10:58:37.000000000 -0400
| @@ -519,8 +519,14 @@
| 
|  struct tty_struct *devpts_get_tty(struct inode *pts_inode, int number)
|  {
| +       struct dentry *dentry;
| +
|         BUG_ON(pts_inode->i_rdev == MKDEV(TTYAUX_MAJOR, PTMX_MINOR));
| 
| +       dentry = d_find_alias(pts_inode);
| +       if (IS_ERR(dentry))

Sorry, this should be:

	if (!dentry)

| +               return NULL;
| +
|         if (pts_inode->i_sb->s_magic == DEVPTS_SUPER_MAGIC)
|                 return (struct tty_struct *)pts_inode->i_private;
|         return NULL;
| 
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