From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Ariel Elior <aelior@marvell.com>,
Sudarsana Kalluru <skalluru@marvell.com>,
GR-everest-linux-l2@marvell.com,
"David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>
Subject: [PATCH net-next] bnx2x: Use struct_size() in kzalloc()
Date: Thu, 7 Feb 2019 21:29:10 -0600 [thread overview]
Message-ID: <20190208032910.GA3436@embeddedor> (raw)
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 = kzalloc(size, 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)
Notice that, in this case, variable fsz 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>
---
drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c
index 8e0a317b31f7..a9bdc21873d3 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c
@@ -1654,13 +1654,9 @@ static int bnx2x_vf_mbx_macvlan_list(struct bnx2x *bp,
{
int i, j;
struct bnx2x_vf_mac_vlan_filters *fl = NULL;
- size_t fsz;
- fsz = tlv->n_mac_vlan_filters *
- sizeof(struct bnx2x_vf_mac_vlan_filter) +
- sizeof(struct bnx2x_vf_mac_vlan_filters);
-
- fl = kzalloc(fsz, GFP_KERNEL);
+ fl = kzalloc(struct_size(fl, filters, tlv->n_mac_vlan_filters),
+ GFP_KERNEL);
if (!fl)
return -ENOMEM;
--
2.20.1
next reply other threads:[~2019-02-08 3:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-08 3:29 Gustavo A. R. Silva [this message]
2019-02-09 6:58 ` [PATCH net-next] bnx2x: Use struct_size() in kzalloc() David Miller
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