RE: [PATCH] crypto: aspeed: add error handling if dmam_alloc_coherent() failed

[Neal Liu]

> 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@xxxxxxxxxxxxxx>
> > ---
> >  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.