Re: [PATCH] crypto: amlogic - fix two resources leak

[Kees Cook]

On Fri, Nov 08, 2019 at 09:45:17AM +0000, Corentin Labbe wrote:
> This patch fixes two resources leak that occur on error path.
> 
> Reported-by: coverity-bot <keescook+coverity-bot@xxxxxxxxxxxx>
> Addresses-Coverity-ID: 1487403 ("RESOURCE_LEAK")
> Addresses-Coverity-ID: 1487401 ("Resource leaks")
> Fixes: 48fe583fe541 ("crypto: amlogic - Add crypto accelerator for amlogic GXL")
> Signed-off-by: Corentin Labbe <clabbe@xxxxxxxxxxxx>

Thanks!

Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>

-Kees

> ---
>  drivers/crypto/amlogic/amlogic-gxl-cipher.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/crypto/amlogic/amlogic-gxl-cipher.c b/drivers/crypto/amlogic/amlogic-gxl-cipher.c
> index e9283ffdbd23..58b717aab6e8 100644
> --- a/drivers/crypto/amlogic/amlogic-gxl-cipher.c
> +++ b/drivers/crypto/amlogic/amlogic-gxl-cipher.c
> @@ -131,7 +131,8 @@ static int meson_cipher(struct skcipher_request *areq)
>  	if (areq->iv && ivsize > 0) {
>  		if (ivsize > areq->cryptlen) {
>  			dev_err(mc->dev, "invalid ivsize=%d vs len=%d\n", ivsize, areq->cryptlen);
> -			return -EINVAL;
> +			err = -EINVAL;
> +			goto theend;
>  		}
>  		memcpy(bkeyiv + 32, areq->iv, ivsize);
>  		keyivlen = 48;
> @@ -151,9 +152,10 @@ static int meson_cipher(struct skcipher_request *areq)
>  
>  	phykeyiv = dma_map_single(mc->dev, bkeyiv, keyivlen,
>  				  DMA_TO_DEVICE);
> -	if (dma_mapping_error(mc->dev, phykeyiv)) {
> +	err = dma_mapping_error(mc->dev, phykeyiv);
> +	if (err) {
>  		dev_err(mc->dev, "Cannot DMA MAP KEY IV\n");
> -		return -EFAULT;
> +		goto theend;
>  	}
>  
>  	tloffset = 0;
> @@ -245,7 +247,6 @@ static int meson_cipher(struct skcipher_request *areq)
>  	if (areq->iv && ivsize > 0) {
>  		if (rctx->op_dir == MESON_DECRYPT) {
>  			memcpy(areq->iv, backup_iv, ivsize);
> -			kzfree(backup_iv);
>  		} else {
>  			scatterwalk_map_and_copy(areq->iv, areq->dst,
>  						 areq->cryptlen - ivsize,
> @@ -254,6 +255,7 @@ static int meson_cipher(struct skcipher_request *areq)
>  	}
>  theend:
>  	kzfree(bkeyiv);
> +	kzfree(backup_iv);
>  
>  	return err;
>  }
> -- 
> 2.23.0
> 

-- 
Kees Cook