linux-kernel - Re: WARNING: at lib/idr.c:678 idr_find

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Message-ID: <20130301213511.GF2481@mtj.dyndns.org>
Date:	Fri, 1 Mar 2013 13:35:11 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	markus@...ppelsdorf.de, linux-kernel@...r.kernel.org
Subject: Re: WARNING: at lib/idr.c:678 idr_find_slowpath+0x97/0xc0()

Hello, Andrew.

On Fri, Mar 01, 2013 at 01:31:59PM -0800, Andrew Morton wrote:
> okluar passed a negative `wd' into inotify_rm_watch()?
> 
> I wonder why it did that.  I doubt if inotify_add_watch() ever returns
> negative descriptors, in which case I expect that okular's call to
> inotify_add_watch() returned -1 and an errno and okular forgot to check
> it, and later passed that -1 back into inotify_rm_watch().
> 
> Anyway, I guess we need to make inotify_add_watch() refuse to return
> negative descriptors (presumably this is already the case due to idr
> internals) and make inotify_rm_watch() trap negative values of `wd' up
> front.
> 
> I wonder how many other such gremlins the IDR checking has added.

The WARN_ON() is just for cases where someone might be doing something
crazy with the previous behavior of ignoring high bit.  Maybe I was
being overly paranoid and we should just drop it from idr_find().

Thanks.

-- 
tejun
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