Re: [PATCH v2] fs/pipe: Deinitialize the watch_queue when pipe is freed

[Lee Jones <lee.jones@linaro.org>]

On Wed, 06 Jul 2022, Lee Jones wrote:

> On Mon, 09 May 2022, Eric Biggers wrote:
> 
> > On Mon, May 09, 2022 at 09:17:26PM +0800, Haimin Zhang wrote:
> > > From: Haimin Zhang <tcs_kernel@tencent.com>
> > > 
> > > Add a new function call to deinitialize the watch_queue of a freed pipe.
> > > When a pipe node is freed, it doesn't make pipe->watch_queue->pipe null.
> > > Later when function post_one_notification is called, it will use this
> > > field, but it has been freed and watch_queue->pipe is a dangling pointer.
> > > It makes a uaf issue.
> > > Check wqueu->defunct before pipe check since pipe becomes invalid once all
> > > watch queues were cleared.
> > > 
> > > Reported-by: TCS Robot <tcs_robot@tencent.com>
> > > Signed-off-by: Haimin Zhang <tcs_kernel@tencent.com>
> > 
> > Is this fixing something?  If so it should have a "Fixes" tag.
> 
> It sure is.
> 
> Haimin, are you planning a v3?

This patch is set to fix a pretty public / important bug.

Has there been any more activity that I may have missed?

Perhaps it's been superseded?

-- 
Lee Jones [李琼斯]
Principal Technical Lead - Developer Services
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