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Date: Wed, 1 May 2019 23:56:28 +0000
From: "Allan, Bruce W" <bruce.w.allan@...el.com>
To: "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
"David S. Miller" <davem@...emloft.net>
CC: "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH][next] iavf: use struct_size() helper
> -----Original Message-----
> From: netdev-owner@...r.kernel.org [mailto:netdev-
> owner@...r.kernel.org] On Behalf Of Gustavo A. R. Silva
> Sent: Wednesday, May 01, 2019 10:18 AM
> To: Kirsher, Jeffrey T <jeffrey.t.kirsher@...el.com>; David S. Miller
> <davem@...emloft.net>
> Cc: intel-wired-lan@...ts.osuosl.org; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; Gustavo A. R. Silva <gustavo@...eddedor.com>
> Subject: [PATCH][next] iavf: use struct_size() helper
>
> Make use of the struct_size() helper instead of an open-coded version
> in order to avoid any potential type mistakes, in particular in the
> context in which this code is being used.
>
> So, replace code of the following form:
>
> sizeof(struct virtchnl_ether_addr_list) + (count * sizeof(struct
> virtchnl_ether_addr))
>
> with:
>
> struct_size(veal, list, count)
>
> and so on...
>
> This code was detected with the help of Coccinelle.
What is the Coccinelle script used to detect this issue?
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
> .../net/ethernet/intel/iavf/iavf_virtchnl.c | 37 ++++++++-----------
> 1 file changed, 16 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
> b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
> index e64751da0921..9c80bf972b90 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
> +++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
> @@ -242,7 +242,8 @@ void iavf_configure_queues(struct iavf_adapter
> *adapter)
> struct virtchnl_vsi_queue_config_info *vqci;
> struct virtchnl_queue_pair_info *vqpi;
> int pairs = adapter->num_active_queues;
> - int i, len, max_frame = IAVF_MAX_RXBUFFER;
> + int i, max_frame = IAVF_MAX_RXBUFFER;
> + size_t len;
>
> if (adapter->current_op != VIRTCHNL_OP_UNKNOWN) {
> /* bail because we already have a command pending */
> @@ -251,8 +252,7 @@ void iavf_configure_queues(struct iavf_adapter
> *adapter)
> return;
> }
> adapter->current_op = VIRTCHNL_OP_CONFIG_VSI_QUEUES;
> - len = sizeof(struct virtchnl_vsi_queue_config_info) +
> - (sizeof(struct virtchnl_queue_pair_info) * pairs);
> + len = struct_size(vqci, qpair, pairs);
> vqci = kzalloc(len, GFP_KERNEL);
> if (!vqci)
> return;
> @@ -351,7 +351,8 @@ void iavf_map_queues(struct iavf_adapter
> *adapter)
> {
> struct virtchnl_irq_map_info *vimi;
> struct virtchnl_vector_map *vecmap;
> - int v_idx, q_vectors, len;
> + int v_idx, q_vectors;
> + size_t len;
> struct iavf_q_vector *q_vector;
>
> if (adapter->current_op != VIRTCHNL_OP_UNKNOWN) {
> @@ -364,9 +365,7 @@ void iavf_map_queues(struct iavf_adapter
> *adapter)
>
> q_vectors = adapter->num_msix_vectors - NONQ_VECS;
>
> - len = sizeof(struct virtchnl_irq_map_info) +
> - (adapter->num_msix_vectors *
> - sizeof(struct virtchnl_vector_map));
> + len = struct_size(vimi, vecmap, adapter->num_msix_vectors);
> vimi = kzalloc(len, GFP_KERNEL);
> if (!vimi)
> return;
> @@ -433,9 +432,10 @@ int iavf_request_queues(struct iavf_adapter
> *adapter, int num)
> void iavf_add_ether_addrs(struct iavf_adapter *adapter)
> {
> struct virtchnl_ether_addr_list *veal;
> - int len, i = 0, count = 0;
> + int i = 0, count = 0;
> struct iavf_mac_filter *f;
> bool more = false;
> + size_t len;
>
> if (adapter->current_op != VIRTCHNL_OP_UNKNOWN) {
> /* bail because we already have a command pending */
> @@ -457,15 +457,13 @@ void iavf_add_ether_addrs(struct iavf_adapter
> *adapter)
> }
> adapter->current_op = VIRTCHNL_OP_ADD_ETH_ADDR;
>
> - len = sizeof(struct virtchnl_ether_addr_list) +
> - (count * sizeof(struct virtchnl_ether_addr));
> + len = struct_size(veal, list, count);
> if (len > IAVF_MAX_AQ_BUF_SIZE) {
> dev_warn(&adapter->pdev->dev, "Too many add MAC
> changes in one request\n");
> count = (IAVF_MAX_AQ_BUF_SIZE -
> sizeof(struct virtchnl_ether_addr_list)) /
> sizeof(struct virtchnl_ether_addr);
> - len = sizeof(struct virtchnl_ether_addr_list) +
> - (count * sizeof(struct virtchnl_ether_addr));
> + len = struct_size(veal, list, count);
> more = true;
> }
>
> @@ -505,8 +503,9 @@ void iavf_del_ether_addrs(struct iavf_adapter
> *adapter)
> {
> struct virtchnl_ether_addr_list *veal;
> struct iavf_mac_filter *f, *ftmp;
> - int len, i = 0, count = 0;
> + int i = 0, count = 0;
> bool more = false;
> + size_t len;
>
> if (adapter->current_op != VIRTCHNL_OP_UNKNOWN) {
> /* bail because we already have a command pending */
> @@ -528,15 +527,13 @@ void iavf_del_ether_addrs(struct iavf_adapter
> *adapter)
> }
> adapter->current_op = VIRTCHNL_OP_DEL_ETH_ADDR;
>
> - len = sizeof(struct virtchnl_ether_addr_list) +
> - (count * sizeof(struct virtchnl_ether_addr));
> + len = struct_size(veal, list, count);
> if (len > IAVF_MAX_AQ_BUF_SIZE) {
> dev_warn(&adapter->pdev->dev, "Too many delete MAC
> changes in one request\n");
> count = (IAVF_MAX_AQ_BUF_SIZE -
> sizeof(struct virtchnl_ether_addr_list)) /
> sizeof(struct virtchnl_ether_addr);
> - len = sizeof(struct virtchnl_ether_addr_list) +
> - (count * sizeof(struct virtchnl_ether_addr));
> + len = struct_size(veal, list, count);
> more = true;
> }
> veal = kzalloc(len, GFP_ATOMIC);
> @@ -973,7 +970,7 @@ static void iavf_print_link_message(struct
> iavf_adapter *adapter)
> void iavf_enable_channels(struct iavf_adapter *adapter)
> {
> struct virtchnl_tc_info *vti = NULL;
> - u16 len;
> + size_t len;
> int i;
>
> if (adapter->current_op != VIRTCHNL_OP_UNKNOWN) {
> @@ -983,9 +980,7 @@ void iavf_enable_channels(struct iavf_adapter
> *adapter)
> return;
> }
>
> - len = (adapter->num_tc * sizeof(struct virtchnl_channel_info)) +
> - sizeof(struct virtchnl_tc_info);
> -
> + len = struct_size(vti, list, adapter->num_tc);
> vti = kzalloc(len, GFP_KERNEL);
> if (!vti)
> return;
> --
> 2.21.0
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