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Bluetooth: a2mp: Use struct_size() helper

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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[];
};

size = sizeof(struct foo) + count * sizeof(struct boo);
instance = alloc(size, GFP_KERNEL)

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

size = struct_size(instance, entry, count);
instance = alloc(size, GFP_KERNEL)

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Gustavo A. R. Silva 2019-02-07 18:28:17 -06:00 • committed by Marcel Holtmann
commit 3c97ce1f86
1 changed files with 1 additions and 1 deletions
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2
net/bluetooth/a2mp.c
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@ -174,7 +174,7 @@ static int a2mp_discover_req(struct amp_mgr *mgr, struct sk_buff *skb,
num_ctrl++;
}
len = num_ctrl * sizeof(struct a2mp_cl) + sizeof(*rsp);
len = struct_size(rsp, cl, num_ctrl);
rsp = kmalloc(len, GFP_ATOMIC);
if (!rsp) {
read_unlock(&hci_dev_list_lock);