linux-kernel - Re: [PATCH v5 2/2] crypto: ti: Add driver for DTHE V2 AES Engine (ECB, CBC)

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Message-ID: <aFL9LsQQdG3WTjUD@vaman>
Date: Wed, 18 Jun 2025 23:23:50 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: T Pratham <t-pratham@...com>, "David S. Miller" <davem@...emloft.net>,
	Kamlesh Gurudasani <kamlesh@...com>,
	Vignesh Raghavendra <vigneshr@...com>,
	Praneeth Bajjuri <praneeth@...com>,
	Manorit Chawdhry <m-chawdhry@...com>, linux-kernel@...r.kernel.org,
	linux-crypto@...r.kernel.org, dmaengine@...r.kernel.org
Subject: Re: [PATCH v5 2/2] crypto: ti: Add driver for DTHE V2 AES Engine
 (ECB, CBC)

On 11-06-25, 17:53, Herbert Xu wrote:
> On Tue, Jun 03, 2025 at 06:07:29PM +0530, T Pratham wrote:
> >
> > +	// Need to do a timeout to ensure finalise gets called if DMA callback fails for any reason
> > +	ret = wait_for_completion_timeout(&rctx->aes_compl, msecs_to_jiffies(DTHE_DMA_TIMEOUT_MS));
> 
> This doesn't look safe.  What if the callback is invoked after a
> timeout? That would be a UAF.
> 
> Does the DMA engine provide any timeout mechanism? If not, then
> you could do it with a delayed work struct.  Just make sure that
> you cancel the work struct in the normal path callback.  Vice versa
> you need to terminate the DMA job in the timeout work struct.

Typically no. Most of the hardware may not have capability, so we have
apis to terminate.

-- 
~Vinod