linux-kernel - [PATCH] crypto: sun8i-ce - Use kcalloc() instead of kzalloc()

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Message-Id: <20240121153407.8348-1-erick.archer@gmx.com>
Date: Sun, 21 Jan 2024 16:34:07 +0100
From: Erick Archer <erick.archer@....com>
To: Corentin Labbe <clabbe.montjoie@...il.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Jonathan Corbet <corbet@....net>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Erick Archer <erick.archer@....com>,
	linux-crypto@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] crypto: sun8i-ce - 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/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c
index d358334e5981..ee2a28c906ed 100644
--- a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c
+++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c
@@ -362,7 +362,7 @@ int sun8i_ce_hash_run(struct crypto_engine *engine, void *breq)
 		digestsize = SHA512_DIGEST_SIZE;

 	/* the padding could be up to two block. */
-	buf = kzalloc(bs * 2, GFP_KERNEL | GFP_DMA);
+	buf = kcalloc(2, bs, GFP_KERNEL | GFP_DMA);
 	if (!buf) {
 		err = -ENOMEM;
 		goto theend;
--
2.25.1