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openvswitch: meter: Use struct_size() in 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;
    struct boo entry[];
};

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

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

instance = kzalloc(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: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gustavo A. R. Silva 2019-01-15 15:19:17 -06:00 committed by David S. Miller
parent 3fcb3f9b68
commit c5c3899de0
1 changed files with 1 additions and 2 deletions
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3
net/openvswitch/meter.c
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@ -206,8 +206,7 @@ static struct dp_meter *dp_meter_create(struct nlattr **a)
return ERR_PTR(-EINVAL);
/* Allocate and set up the meter before locking anything. */
meter = kzalloc(n_bands * sizeof(struct dp_meter_band) +
sizeof(*meter), GFP_KERNEL);
meter = kzalloc(struct_size(meter, bands, n_bands), GFP_KERNEL);
if (!meter)
return ERR_PTR(-ENOMEM);