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mtd: cfi: cmdset_0001: Use struct_size() in kmalloc()

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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 = kmalloc(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 = kmalloc(struct_size(instance, entry, count), GFP_KERNEL);

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Boris Brezillon <bbrezillon@kernel.org>
This commit is contained in:
Gustavo A. R. Silva 2019-01-08 09:52:44 -06:00 committed by Boris Brezillon
parent 9cb76a6aa1
commit 04b4c06caf
1 changed files with 2 additions and 1 deletions
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3
drivers/mtd/chips/cfi_cmdset_0001.c
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@ -756,7 +756,8 @@ static int cfi_intelext_partition_fixup(struct mtd_info *mtd,
}
numvirtchips = cfi->numchips * numparts;
newcfi = kmalloc(sizeof(struct cfi_private) + numvirtchips * sizeof(struct flchip), GFP_KERNEL);
newcfi = kmalloc(struct_size(newcfi, chips, numvirtchips),
GFP_KERNEL);
if (!newcfi)
return -ENOMEM;
shared = kmalloc_array(cfi->numchips,