netdev - Re: [V9fs-developer] [PATCH] 9p: fix Use-After-Free in p9_write

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Date:   Mon, 30 Jul 2018 02:18:00 +0200
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Tomas Bortoli <tomasbortoli@...il.com>
Cc:     v9fs-developer@...ts.sourceforge.net, syzkaller@...glegroups.com,
        davem@...emloft.net, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [V9fs-developer] [PATCH] 9p: fix Use-After-Free in
 p9_write_work()

Dominique Martinet wrote on Mon, Jul 30, 2018:
> Basically, a more global view of the problem is a race between
> p9_tag_lookup returning a p9_req_t and another thread freeing it.

(just correcting myself here, p9_tag_lookup won't be enough for the
write side, but similarily you'd just need to increment the refcount
when you schedule work with it and decrement when the worker is done)

-- 
Dominique