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cxgb3/l2t: Use struct_size() in kvzalloc()

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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 = kvzalloc(size, GFP_KERNEL);

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

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

Notice that, in this case, variable size is not necessary, hence
it is removed.

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 2019-03-29 10:28:41 -05:00 • committed by David S. Miller
commit db4863fdb8
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/chelsio/cxgb3/l2t.c
View file

@ -443,9 +443,9 @@ found:
struct l2t_data *t3_init_l2t(unsigned int l2t_capacity)
{
struct l2t_data *d;
int i, size = sizeof(*d) + l2t_capacity * sizeof(struct l2t_entry);
int i;
d = kvzalloc(size, GFP_KERNEL);
d = kvzalloc(struct_size(d, l2tab, l2t_capacity), GFP_KERNEL);
if (!d)
return NULL;