linux-hardening - [PATCH] accel/habanalabs: use kcalloc() instead of kzalloc()

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Date: Sat, 20 Jan 2024 16:10:28 +0100
From: Erick Archer <erick.archer@....com>
To: Oded Gabbay <ogabbay@...nel.org>,
	Marco Pagani <marpagan@...hat.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Erick Archer <erick.archer@....com>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] accel/habanalabs: use kcalloc() instead of kzalloc()

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() function instead of the argument
size * count in the kzalloc() 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/accel/habanalabs/common/mmu/mmu_v1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/accel/habanalabs/common/mmu/mmu_v1.c b/drivers/accel/habanalabs/common/mmu/mmu_v1.c
index d925dc4dd097..e3d42cfead27 100644
--- a/drivers/accel/habanalabs/common/mmu/mmu_v1.c
+++ b/drivers/accel/habanalabs/common/mmu/mmu_v1.c
@@ -232,7 +232,7 @@ static int dram_default_mapping_init(struct hl_ctx *ctx)
 	/* add hop1 and hop2 */
 	total_hops = num_of_hop3 + 2;

-	ctx->dram_default_hops = kzalloc(HL_PTE_SIZE * total_hops,  GFP_KERNEL);
+	ctx->dram_default_hops = kcalloc(total_hops, HL_PTE_SIZE,  GFP_KERNEL);
 	if (!ctx->dram_default_hops)
 		return -ENOMEM;

--
2.25.1