linux-hardening - Re: [PATCH] crypto: qat - use kcalloc_node() instead of kzalloc

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Date: Mon, 22 Jan 2024 11:55:21 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Erick Archer <erick.archer@....com>,
 Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
 Herbert Xu <herbert@...dor.apana.org.au>,
 "David S. Miller" <davem@...emloft.net>,
 Tero Kristo <tero.kristo@...ux.intel.com>,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Damian Muszynski <damian.muszynski@...el.com>,
 Shashank Gupta <shashank.gupta@...el.com>,
 Tom Zanussi <tom.zanussi@...ux.intel.com>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: qat-linux@...el.com, linux-crypto@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] crypto: qat - use kcalloc_node() instead of
 kzalloc_node()



On 1/21/24 10:40, Erick Archer wrote:
> As noted in the "Deprecated Interfaces, Language Features, Attributes,
> and Conventions" documentation [1], size calculations (especially
> multiplication) should not be performed in memory allocator (or similar)
> function arguments due to the risk of them overflowing. This could lead
> to values wrapping around and a smaller allocation being made than the
> caller was expecting. Using those allocations could lead to linear
> overflows of heap memory and other misbehaviors.
> 
> So, use the purpose specific kcalloc_node() function instead of the
> argument count * size in the kzalloc_node() function.
> 
> Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1]
> Link: https://github.com/KSPP/linux/issues/162
> Signed-off-by: Erick Archer <erick.archer@....com>

Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks!
-- 
Gustavo

> ---
>   drivers/crypto/intel/qat/qat_common/adf_isr.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/crypto/intel/qat/qat_common/adf_isr.c b/drivers/crypto/intel/qat/qat_common/adf_isr.c
> index 3557a0d6dea2..a13d9885d60f 100644
> --- a/drivers/crypto/intel/qat/qat_common/adf_isr.c
> +++ b/drivers/crypto/intel/qat/qat_common/adf_isr.c
> @@ -272,7 +272,7 @@ static int adf_isr_alloc_msix_vectors_data(struct adf_accel_dev *accel_dev)
>   	if (!accel_dev->pf.vf_info)
>   		msix_num_entries += hw_data->num_banks;
> 
> -	irqs = kzalloc_node(msix_num_entries * sizeof(*irqs),
> +	irqs = kcalloc_node(msix_num_entries, sizeof(*irqs),
>   			    GFP_KERNEL, dev_to_node(&GET_DEV(accel_dev)));
>   	if (!irqs)
>   		return -ENOMEM;
> --
> 2.25.1
>