| Message ID | 20190131002744.GA26706@embeddedor |
|---|---|
| State | Accepted |
| Delegated to: | David Miller |
| Headers | show |
| Series | [net-next] cxgb4: smt: use struct_size() in kvzalloc() | expand |
From: "Gustavo A. R. Silva" <gustavo@embeddedor.com> Date: Wed, 30 Jan 2019 18:27:44 -0600 > 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 = kvzalloc(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 = kvzalloc(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> Applied.
diff --git a/drivers/net/ethernet/chelsio/cxgb4/smt.c b/drivers/net/ethernet/chelsio/cxgb4/smt.c index 7b2207a2a130..eaf1fb74689c 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/smt.c +++ b/drivers/net/ethernet/chelsio/cxgb4/smt.c @@ -47,8 +47,7 @@ struct smt_data *t4_init_smt(void) smt_size = SMT_SIZE; - s = kvzalloc(sizeof(*s) + smt_size * sizeof(struct smt_entry), - GFP_KERNEL); + s = kvzalloc(struct_size(s, smtab, smt_size), GFP_KERNEL); if (!s) return NULL; s->smt_size = smt_size;
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 = kvzalloc(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 = kvzalloc(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> --- drivers/net/ethernet/chelsio/cxgb4/smt.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)