linux-kernel - Re: [PATCH] devpts: Fix NULL pointer dereference in dcache

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Message-ID: <20191004142748.GG26530@ZenIV.linux.org.uk>
Date:   Fri, 4 Oct 2019 15:27:48 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Amir Goldstein <amir73il@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Varad Gautam <vrd@...zon.de>, stable@...r.kernel.org,
        Jan Glauber <jglauber@...vell.com>
Subject: Re: [PATCH] devpts: Fix NULL pointer dereference in dcache_readdir()

On Fri, Oct 04, 2019 at 04:05:03PM +0200, Christian Brauner wrote:
> From: Will Deacon <will@...nel.org>
> 
> Closing /dev/pts/ptmx removes the corresponding pty under /dev/pts/
> without synchronizing against concurrent path walkers. This can lead to
> 'dcache_readdir()' tripping over a 'struct dentry' with a NULL 'd_inode'
> field:

FWIW, vfs.git#fixes (or #next.dcache) ought to deal with that one.