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From: Jens Axboe <axboe@kernel.dk>
To: Guoyu Huang <hgy5945@gmail.com>, viro@zeniv.linux.org.uk
Cc: linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] io_uring: Fix use-after-free in io_sq_wq_submit_work()
Date: Wed, 5 Aug 2020 13:10:54 -0600	[thread overview]
Message-ID: <f4e1b9ee-1b13-9862-8df8-cdad62821715@kernel.dk> (raw)
In-Reply-To: <20200805034042.GA29805@ubuntu>

On 8/4/20 9:40 PM, Guoyu Huang wrote:
> when ctx->sqo_mm is zero, io_sq_wq_submit_work() frees 'req'
> without deleting it from 'task_list'. After that, 'req' is
> accessed in io_ring_ctx_wait_and_kill() which lead to
> a use-after-free.

This looks like an old one, that affects 5.4 only. I've massaged
it to apply on top of another fix, will ask to get it queued up for
stable. Thanks!

-- 
Jens Axboe


      reply	other threads:[~2020-08-05 19:14 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-05  3:40 Guoyu Huang
2020-08-05 19:10 ` Jens Axboe [this message]

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