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

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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>
This commit is contained in:
Gustavo A. R. Silva 2018-08-23 20:09:38 -05:00 committed by Miquel Raynal
parent 81592c69c9
commit 2f91eb6951
1 changed files with 1 additions and 3 deletions
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4
drivers/mtd/nand/raw/atmel/nand-controller.c
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@ -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);