linux-kernel - Re: BUG_ON(nd->inode != parent->d

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Date:	Fri, 8 Mar 2013 21:26:23 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: BUG_ON(nd->inode != parent->d_inode);

On Fri, Mar 08, 2013 at 06:08:52PM -0800, Linus Torvalds wrote:
 > On Fri, Mar 8, 2013 at 6:03 PM, Dave Jones <davej@...hat.com> wrote:
 > >
 > > existing pathname + 'a' = fine.
 > >
 > > existing pathname + '/' + 'a' = boom.
 > 
 > Good.
 > 
 > > Looks like if I do this..
 > >
 > >        if (isdigit(newpath[len]) != 0) {
 > >                 newpath[len] = '/';
 > >                newpath[len+1] = 'A';
 > >                newpath[len+2] = 0;
 > >
 > > no bug.
 > 
 > Well, but that will never trigger. newpath[len] will always be NUL, so
 > you just disabled things entirely. Use "len-1".
 > 
 > So I don't think that did what you meant it to do.

Fixed that up, and even double checked my sanity by printing stuff out.

Confirmed that it's something that doesn't end in a number.

	Dave

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