linux-kernel - Re: [syzbot] [v9fs?] KASAN: slab-use-after-free Read in p9_fid

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Message-ID: <641239.1716487625@warthog.procyon.org.uk>
Date: Thu, 23 May 2024 19:07:05 +0100
From: David Howells <dhowells@...hat.com>
To: asmadeus@...ewreck.org
Cc: dhowells@...hat.com,
    syzbot <syzbot+d7c7a495a5e466c031b6@...kaller.appspotmail.com>,
    brauner@...nel.org, hdanton@...a.com, linux-kernel@...r.kernel.org,
    syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [v9fs?] KASAN: slab-use-after-free Read in p9_fid_destroy

asmadeus@...ewreck.org wrote:

> > There's a problem in 9p's interaction with netfslib whereby a crash occurs
> > because the 9p_fid structs get forcibly destroyed during client teardown
> > (without paying attention to their refcounts) before netfslib has finished
> > with them.  However, it's not a simple case of deferring the clunking that
> > p9_fid_put() does as that requires the client.
> 
> "as that requires the client" doesn't parse

"... as that requires the p9_client record to still be present."?

David