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
Link: https://github.com/KSPP/linux/issues/162
Signed-off-by: Erick Archer <erick.archer@gmx.com>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c
index d358334e598115649b6cc77b807dedb201eddb1c..ee2a28c906edee3d30b4f828ebe83b4a8e915867 100644 (file)
--- 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;