linux-kernel - Re: [PATCH v2] fs/pipe: Deinitialize the watch

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Message-ID: <Ynl+kUGRYaovLc8q@sol.localdomain>
Date:   Mon, 9 May 2022 13:50:25 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Haimin Zhang <tcs.kernel@...il.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        David Howells <dhowells@...hat.com>,
        "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Haimin Zhang <tcs_kernel@...cent.com>,
        TCS Robot <tcs_robot@...cent.com>
Subject: Re: [PATCH v2] fs/pipe: Deinitialize the watch_queue when pipe is
 freed

On Mon, May 09, 2022 at 09:17:26PM +0800, Haimin Zhang wrote:
> From: Haimin Zhang <tcs_kernel@...cent.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@...cent.com>
> Signed-off-by: Haimin Zhang <tcs_kernel@...cent.com>

Is this fixing something?  If so it should have a "Fixes" tag.

- Eric