dmaengine: milbeaut-hdmac: Prefer kcalloc over open coded arithmetic

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.

[1] https://www.kernel.org/doc/html/v5.14/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments

Signed-off-by: Len Baker <len.baker@gmx.com>
Link: https://lore.kernel.org/r/20210904145813.5161-1-len.baker@gmx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/milbeaut-hdmac.c b/drivers/dma/milbeaut-hdmac.c
index a8cfb59f6efe2e36e1246bc0677bbaa8812f58ef..1b0a95892627d6dc31439b9112f1c76d9b86071d 100644 (file)
--- a/drivers/dma/milbeaut-hdmac.c
+++ b/drivers/dma/milbeaut-hdmac.c
@@ -269,7 +269,7 @@ milbeaut_hdmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
        if (!md)
                return NULL;
 
-       md->sgl = kzalloc(sizeof(*sgl) * sg_len, GFP_NOWAIT);
+       md->sgl = kcalloc(sg_len, sizeof(*sgl), GFP_NOWAIT);
        if (!md->sgl) {
                kfree(md);
                return NULL;