linux-kernel - [PATCH] net: hinic: Fix warning-hinic_set_vlan_fliter() warn: variable dereferenced before check 'hwdev'

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Message-Id: <20230918123401.6951-1-cai.huoqing@linux.dev>
Date:   Mon, 18 Sep 2023 20:34:01 +0800
From:   Cai Huoqing <cai.huoqing@...ux.dev>
To:     cai.huoqing@...ux.dev
Cc:     Dan Carpenter <dan.carpenter@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: hinic: Fix warning-hinic_set_vlan_fliter() warn: variable dereferenced before check 'hwdev'

Fix warning, 'hwdev' is checked too late

Fixes: 2acf960e3be6 ("net: hinic: Add support for configuration of rx-vlan-filter by ethtool")
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Closes: https://lore.kernel.org/r/202309112354.pikZCmyk-lkp@intel.com/
Signed-off-by: Cai Huoqing <cai.huoqing@...ux.dev>
---
 drivers/net/ethernet/huawei/hinic/hinic_port.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/huawei/hinic/hinic_port.c b/drivers/net/ethernet/huawei/hinic/hinic_port.c
index 9406237c461e..bf920c709f82 100644
--- a/drivers/net/ethernet/huawei/hinic/hinic_port.c
+++ b/drivers/net/ethernet/huawei/hinic/hinic_port.c
@@ -450,8 +450,8 @@ int hinic_set_rx_vlan_offload(struct hinic_dev *nic_dev, u8 en)
 int hinic_set_vlan_fliter(struct hinic_dev *nic_dev, u32 en)
 {
 	struct hinic_hwdev *hwdev = nic_dev->hwdev;
-	struct hinic_hwif *hwif = hwdev->hwif;
-	struct pci_dev *pdev = hwif->pdev;
+	struct hinic_hwif *hwif;
+	struct pci_dev *pdev;
 	struct hinic_vlan_filter vlan_filter;
 	u16 out_size = sizeof(vlan_filter);
 	int err;
@@ -459,6 +459,9 @@ int hinic_set_vlan_fliter(struct hinic_dev *nic_dev, u32 en)
 	if (!hwdev)
 		return -EINVAL;
 
+	hwif = hwdev->hwif;
+	pdev = hwif->pdev;
+
 	vlan_filter.func_idx = HINIC_HWIF_FUNC_IDX(hwif);
 	vlan_filter.enable = en;
 
-- 
2.34.1