linux-kernel - Re: [PATCH v3 1/2] crypto: caam - fix pkcs1pad(rsa-caam, sha256) failure because of invalid input

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Date:   Mon, 27 May 2019 16:37:15 +0000
From:   Horia Geanta <horia.geanta@....com>
To:     Iuliana Prodan <iuliana.prodan@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Aymen Sghaier <aymen.sghaier@....com>
CC:     "David S. Miller" <davem@...emloft.net>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH v3 1/2] crypto: caam - fix pkcs1pad(rsa-caam, sha256)
 failure because of invalid input

On 5/24/2019 5:46 PM, Iuliana Prodan wrote:
> @@ -1030,17 +1076,26 @@ int caam_pkc_init(struct device *ctrldev)
>  	if (!pk_inst)
>  		return 0;
>  
> +	/* allocate zero buffer, used for padding input */
> +	zero_buffer = kzalloc(CAAM_RSA_MAX_INPUT_SIZE - 1, GFP_DMA |
> +			      GFP_KERNEL);
> +	if (!zero_buffer)
> +		err = -ENOMEM;
Either return -ENOMEM or jump to a label before return err.

> +
>  	err = crypto_register_akcipher(&caam_rsa);
> -	if (err)
> +	if (err) {
> +		kfree(zero_buffer);
>  		dev_warn(ctrldev, "%s alg registration failed\n",
>  			 caam_rsa.base.cra_driver_name);
> -	else
> +	} else {
>  		dev_info(ctrldev, "caam pkc algorithms registered in /proc/crypto\n");
> +	}
>  
>  	return err;
>  }
>  
>  void caam_pkc_exit(void)
>  {
> +	kfree(zero_buffer);
>  	crypto_unregister_akcipher(&caam_rsa);
>  }

Regards,
Horia