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From: Roman Kagan <rkagan@virtuozzo.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] idr: fix invalid ptr dereference on item delete
Date: Fri, 18 May 2018 23:23:08 +0300	[thread overview]
Message-ID: <20180518202307.GB753@rkaganb.sw.ru> (raw)
In-Reply-To: <20180518175025.GD6361@bombadil.infradead.org>

On Fri, May 18, 2018 at 10:50:25AM -0700, Matthew Wilcox wrote:
> It'd be nice if you cc'd the person who wrote the code you're patching.
> You'd get a response a lot quicker than waiting until I happened to
> notice the email in a different forum.

I sent it to someone called "Matthew Wilcox <mawilcox@microsoft.com>".
Also I cc'd that guy when I only started to point the finger at IDR as
the suspected culprit in that syzcaller report.  I thought it was him
who wrote the code...

> Thanks for finding the situation that leads to the bug.  Your fix is
> incorrect; it's legitimate to store a NULL value at offset 0, and
> your patch makes it impossible to delete.  Fortunately, the test-suite
> covers that case ;-)

How do you build it?  I wish I had it when debugging but I got linking
errors due to missing spin_lock_init, so I decided it wasn't up-to-date.

Thanks,
Roman.

P.S. I'll forward your message to all the recepients of my patch, to let
them know it's wrong and you have a better one.

  reply	other threads:[~2018-05-18 20:23 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-18 17:50 Matthew Wilcox
2018-05-18 20:23 ` Roman Kagan [this message]
2018-05-19  0:31   ` Matthew Wilcox
2018-05-18 22:31 ` Andrew Morton
2018-05-19  0:28   ` Matthew Wilcox
2018-05-19  6:26   ` Roman Kagan
2018-05-19 14:14     ` Matthew Wilcox
2018-05-21 19:13       ` Andrew Morton
  -- strict thread matches above, loose matches on Subject: below --
2018-05-10 19:16 Roman Kagan
2018-05-10 23:54 ` Paolo Bonzini
2018-05-11  5:40   ` Dmitry Vyukov
2018-05-11  5:57     ` Roman Kagan
2018-05-11  9:12       ` Paolo Bonzini
2018-05-18 20:29 ` Roman Kagan

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