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md: raid10: 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;
   struct boo entry[];
};

instance = kmalloc(size, 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: Song Liu <songliubraving@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Gustavo A. R. Silva
2019-06-14 15:41:09 -07:00
committed by Jens Axboe
parent ebfeb444fa
commit 8cf05a7841
1 changed files with 1 additions and 2 deletions
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3
drivers/md/raid10.c
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@@ -4755,8 +4755,7 @@ static int handle_reshape_read_error(struct mddev *mddev,
int idx = 0;
struct page **pages;
r10b = kmalloc(sizeof(*r10b) +
sizeof(struct r10dev) * conf->copies, GFP_NOIO);
r10b = kmalloc(struct_size(r10b, devs, conf->copies), GFP_NOIO);
if (!r10b) {
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
return -ENOMEM;