linux-kernel - RE: [PATCH] crypto: aspeed: add error handling if dmam_alloc

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Date:   Thu, 23 Feb 2023 10:03:07 +0000
From:   Neal Liu <neal_liu@...eedtech.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
CC:     Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...id.au>,
        "David S . Miller" <davem@...emloft.net>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>
Subject: RE: [PATCH] crypto: aspeed: add error handling if
 dmam_alloc_coherent() failed

> On Thu, Feb 23, 2023 at 04:58:30PM +0800, Neal Liu wrote:
> > Since the acry_dev->buf_addr may be NULL, add error handling to
> > prevent any additional access to avoid potential issues.
> >
> > Signed-off-by: Neal Liu <neal_liu@...eedtech.com>
> > ---
> >  drivers/crypto/aspeed/aspeed-acry.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/crypto/aspeed/aspeed-acry.c
> > b/drivers/crypto/aspeed/aspeed-acry.c
> > index 1f77ebd73489..85733e418c9e 100644
> > --- a/drivers/crypto/aspeed/aspeed-acry.c
> > +++ b/drivers/crypto/aspeed/aspeed-acry.c
> > @@ -782,6 +782,11 @@ static int aspeed_acry_probe(struct
> platform_device *pdev)
> >  	acry_dev->buf_addr = dmam_alloc_coherent(dev,
> ASPEED_ACRY_BUFF_SIZE,
> >  						 &acry_dev->buf_dma_addr,
> >  						 GFP_KERNEL);
> > +	if (!acry_dev->buf_addr) {
> > +		rc = -ENOMEM;
> > +		goto err_engine_rsa_start;
> > +	}
> > +
> >  	memzero_explicit(acry_dev->buf_addr, ASPEED_ACRY_BUFF_SIZE);
> 
> Please remove this memzero in a follow-up patch as dmam_alloc_coherent
> returns memory that's already zeroed.
> 
> Thanks,

Okay, thanks for the information.