mtd: rawnand: atmel: use struct_size() in devm_kzalloc()

One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:

struct foo {
	int stuff;
        void *entry[];
};

instance = devm_kzalloc(dev, sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:

instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL);

This issue was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

1 files changed, 1 insertions, 3 deletions

diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c
index 525e1325841d..8b9e05ac24ee 100644
--- a/drivers/mtd/nand/raw/atmel/nand-controller.c
+++ b/drivers/mtd/nand/raw/atmel/nand-controller.c
@@ -1577,9 +1577,7 @@ static struct atmel_nand *atmel_nand_create(struct atmel_nand_controller *nc,
 		return ERR_PTR(-EINVAL);
 	}
 
-	nand = devm_kzalloc(nc->dev,
-			    sizeof(*nand) + (numcs * sizeof(*nand->cs)),
-			    GFP_KERNEL);
+	nand = devm_kzalloc(nc->dev, struct_size(nand, cs, numcs), GFP_KERNEL);
 	if (!nand) {
 		dev_err(nc->dev, "Failed to allocate NAND object\n");
 		return ERR_PTR(-ENOMEM);