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Subject[PATCH net-next 09/12] net: hns3: fix for dereferencing before null checking
Date
From: Yunsheng Lin <linyunsheng@huawei.com>

The netdev is dereferenced before null checking in the function
hns3_setup_tc.

This patch moves the dereferencing after the null checking.

Fixes: 76ad4f0ee747 ("net: hns3: Add support of HNS3 Ethernet Driver for hip08 SoC")

Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
---
drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 73de4b0..1a602bd 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -1510,12 +1510,12 @@ static void hns3_nic_get_stats64(struct net_device *netdev,
static int hns3_setup_tc(struct net_device *netdev, void *type_data)
{
struct tc_mqprio_qopt_offload *mqprio_qopt = type_data;
- struct hnae3_handle *h = hns3_get_handle(netdev);
- struct hnae3_knic_private_info *kinfo = &h->kinfo;
u8 *prio_tc = mqprio_qopt->qopt.prio_tc_map;
+ struct hnae3_knic_private_info *kinfo;
u8 tc = mqprio_qopt->qopt.num_tc;
u16 mode = mqprio_qopt->mode;
u8 hw = mqprio_qopt->qopt.hw;
+ struct hnae3_handle *h;

if (!((hw == TC_MQPRIO_HW_OFFLOAD_TCS &&
mode == TC_MQPRIO_MODE_CHANNEL) || (!hw && tc == 0)))
@@ -1527,6 +1527,9 @@ static int hns3_setup_tc(struct net_device *netdev, void *type_data)
if (!netdev)
return -EINVAL;

+ h = hns3_get_handle(netdev);
+ kinfo = &h->kinfo;
+
return (kinfo->dcb_ops && kinfo->dcb_ops->setup_tc) ?
kinfo->dcb_ops->setup_tc(h, tc, prio_tc) : -EOPNOTSUPP;
}
--
2.7.4
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