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Subject[PATCH net-next 20/23] {topost} net: hns3: fix for buffer overflow smatch warning
Date
From: Yunsheng Lin <linyunsheng@huawei.com>

This patch fixes the buffer overflow warning by refactoring
hclgevf_bind_ring_to_vector and hclge_get_ring_chain_from_mbx.

Fixes: e2cb1dec9779 ("net: hns3: Add HNS3 VF HCL(Hardware Compatibility Layer) Support")
Fixes: dde1a86e93ca ("net: hns3: Add mailbox support to PF driver")
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
---
drivers/net/ethernet/hisilicon/hns3/hclge_mbx.h | 2 +
.../net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c | 19 ++++---
.../ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c | 60 ++++++++++------------
3 files changed, 39 insertions(+), 42 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hclge_mbx.h b/drivers/net/ethernet/hisilicon/hns3/hclge_mbx.h
index 3e9203e..e6e1d22 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hclge_mbx.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hclge_mbx.h
@@ -57,6 +57,8 @@ enum hclge_mbx_vlan_cfg_subcode {

#define HCLGE_MBX_MAX_MSG_SIZE 16
#define HCLGE_MBX_MAX_RESP_DATA_SIZE 8
+#define HCLGE_MBX_RING_MAP_BASIC_MSG_NUM 3
+#define HCLGE_MBX_RING_NODE_VARIABLE_NUM 3

struct hclgevf_mbx_resp_status {
struct mutex mbx_mutex; /* protects against contending sync cmd resp */
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
index ed34ca3..e3e4ded 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c
@@ -105,14 +105,17 @@ static int hclge_get_ring_chain_from_mbx(
struct hnae3_ring_chain_node *ring_chain,
struct hclge_vport *vport)
{
-#define HCLGE_RING_NODE_VARIABLE_NUM 3
-#define HCLGE_RING_MAP_MBX_BASIC_MSG_NUM 3
struct hnae3_ring_chain_node *cur_chain, *new_chain;
int ring_num;
int i;

ring_num = req->msg[2];

+ if (ring_num > ((HCLGE_MBX_VF_MSG_DATA_NUM -
+ HCLGE_MBX_RING_MAP_BASIC_MSG_NUM) /
+ HCLGE_MBX_RING_NODE_VARIABLE_NUM))
+ return -ENOMEM;
+
hnae_set_bit(ring_chain->flag, HNAE3_RING_TYPE_B, req->msg[3]);
ring_chain->tqp_index =
hclge_get_queue_id(vport->nic.kinfo.tqp[req->msg[4]]);
@@ -128,18 +131,18 @@ static int hclge_get_ring_chain_from_mbx(
goto err;

hnae_set_bit(new_chain->flag, HNAE3_RING_TYPE_B,
- req->msg[HCLGE_RING_NODE_VARIABLE_NUM * i +
- HCLGE_RING_MAP_MBX_BASIC_MSG_NUM]);
+ req->msg[HCLGE_MBX_RING_NODE_VARIABLE_NUM * i +
+ HCLGE_MBX_RING_MAP_BASIC_MSG_NUM]);

new_chain->tqp_index =
hclge_get_queue_id(vport->nic.kinfo.tqp
- [req->msg[HCLGE_RING_NODE_VARIABLE_NUM * i +
- HCLGE_RING_MAP_MBX_BASIC_MSG_NUM + 1]]);
+ [req->msg[HCLGE_MBX_RING_NODE_VARIABLE_NUM * i +
+ HCLGE_MBX_RING_MAP_BASIC_MSG_NUM + 1]]);

hnae_set_field(new_chain->int_gl_idx, HCLGE_INT_GL_IDX_M,
HCLGE_INT_GL_IDX_S,
- req->msg[HCLGE_RING_NODE_VARIABLE_NUM * i +
- HCLGE_RING_MAP_MBX_BASIC_MSG_NUM + 2]);
+ req->msg[HCLGE_MBX_RING_NODE_VARIABLE_NUM * i +
+ HCLGE_MBX_RING_MAP_BASIC_MSG_NUM + 2]);

cur_chain->next = new_chain;
cur_chain = new_chain;
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
index 6bce99a..b5cb8fb 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
@@ -533,13 +533,11 @@ static int hclgevf_bind_ring_to_vector(struct hnae3_handle *handle, bool en,
int vector,
struct hnae3_ring_chain_node *ring_chain)
{
-#define HCLGEVF_RING_NODE_VARIABLE_NUM 3
-#define HCLGEVF_RING_MAP_MBX_BASIC_MSG_NUM 3
struct hclgevf_dev *hdev = hclgevf_ae_get_hdev(handle);
struct hnae3_ring_chain_node *node;
struct hclge_mbx_vf_to_pf_cmd *req;
struct hclgevf_desc desc;
- int i, vector_id;
+ int i = 0, vector_id;
int status;
u8 type;

@@ -551,28 +549,33 @@ static int hclgevf_bind_ring_to_vector(struct hnae3_handle *handle, bool en,
return vector_id;
}

- hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_VF_TO_PF, false);
- type = en ?
- HCLGE_MBX_MAP_RING_TO_VECTOR : HCLGE_MBX_UNMAP_RING_TO_VECTOR;
- req->msg[0] = type;
- req->msg[1] = vector_id; /* vector_id should be id in VF */
-
- i = 0;
for (node = ring_chain; node; node = node->next) {
- i++;
- /* msg[2] is cause num */
- req->msg[HCLGEVF_RING_NODE_VARIABLE_NUM * i] =
+ int idx_offset = HCLGE_MBX_RING_MAP_BASIC_MSG_NUM +
+ HCLGE_MBX_RING_NODE_VARIABLE_NUM * i;
+
+ if (i == 0) {
+ hclgevf_cmd_setup_basic_desc(&desc,
+ HCLGEVF_OPC_MBX_VF_TO_PF,
+ false);
+ type = en ?
+ HCLGE_MBX_MAP_RING_TO_VECTOR :
+ HCLGE_MBX_UNMAP_RING_TO_VECTOR;
+ req->msg[0] = type;
+ req->msg[1] = vector_id;
+ }
+
+ req->msg[idx_offset] =
hnae_get_bit(node->flag, HNAE3_RING_TYPE_B);
- req->msg[HCLGEVF_RING_NODE_VARIABLE_NUM * i + 1] =
- node->tqp_index;
- req->msg[HCLGEVF_RING_NODE_VARIABLE_NUM * i + 2] =
- hnae_get_field(node->int_gl_idx,
- HNAE3_RING_GL_IDX_M,
- HNAE3_RING_GL_IDX_S);
-
- if (i == (HCLGE_MBX_VF_MSG_DATA_NUM -
- HCLGEVF_RING_MAP_MBX_BASIC_MSG_NUM) /
- HCLGEVF_RING_NODE_VARIABLE_NUM) {
+ req->msg[idx_offset + 1] = node->tqp_index;
+ req->msg[idx_offset + 2] = hnae_get_field(node->int_gl_idx,
+ HNAE3_RING_GL_IDX_M,
+ HNAE3_RING_GL_IDX_S);
+
+ i++;
+ if ((i == (HCLGE_MBX_VF_MSG_DATA_NUM -
+ HCLGE_MBX_RING_MAP_BASIC_MSG_NUM) /
+ HCLGE_MBX_RING_NODE_VARIABLE_NUM) ||
+ !node->next) {
req->msg[2] = i;

status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
@@ -591,17 +594,6 @@ static int hclgevf_bind_ring_to_vector(struct hnae3_handle *handle, bool en,
}
}

- if (i > 0) {
- req->msg[2] = i;
-
- status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
- if (status) {
- dev_err(&hdev->pdev->dev,
- "Map TQP fail, status is %d.\n", status);
- return status;
- }
- }
-
return 0;
}

--
2.9.3
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