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Subject[PATCH net-next] openvswitch: meter: Use struct_size() in kzalloc()
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>
---
net/openvswitch/meter.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/openvswitch/meter.c b/net/openvswitch/meter.c
index c038e021a591..43849d752a1e 100644
--- a/net/openvswitch/meter.c
+++ b/net/openvswitch/meter.c
@@ -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);

--
2.20.1
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