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

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Date: Sun, 21 Jan 2024 17:40:43 +0100
From: Erick Archer <erick.archer@....com>
To: Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Erick Archer <erick.archer@....com>,
	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: [PATCH] crypto: qat - use kcalloc_node() instead of kzalloc_node()

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>
---
 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