2023-02-23 09:00:27

by Neal Liu

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

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 <[email protected]>
---
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);

aspeed_acry_register(acry_dev);
--
2.25.1

2023-02-23 09:33:02

by Herbert Xu

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 <[email protected]>
> ---
> 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,
--
Email: Herbert Xu <[email protected]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

2023-02-23 10:03:21

by Neal Liu

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 <[email protected]>
> > ---
> > 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.