netdev - [PATCH] mt76: mt7915: Fix PCI device refcount leak in mt7915_pci_init

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Date:   Fri, 25 Nov 2022 10:58:31 +0800
From:   Xiongfeng Wang <wangxiongfeng2@...wei.com>
To:     <nbd@....name>, <lorenzo@...nel.org>, <ryder.lee@...iatek.com>,
        <shayne.chen@...iatek.com>, <sean.wang@...iatek.com>,
        <kvalo@...nel.org>, <davem@...emloft.net>, <edumazet@...gle.com>,
        <kuba@...nel.org>, <pabeni@...hat.com>, <matthias.bgg@...il.com>,
        <sujuan.chen@...iatek.com>, <Bo.Jiao@...iatek.com>
CC:     <linux-wireless@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <yangyingliang@...wei.com>,
        <wangxiongfeng2@...wei.com>
Subject: [PATCH] mt76: mt7915: Fix PCI device refcount leak in mt7915_pci_init_hif2()

As comment of pci_get_device() says, it returns a pci_device with its
refcount increased. We need to call pci_dev_put() to decrease the
refcount. Save the return value of pci_get_device() and call
pci_dev_put() to decrease the refcount.

Fixes: 9093cfff72e3 ("mt76: mt7915: add support for using a secondary PCIe link for gen1")
Fixes: 2e30db0dde61 ("mt76: mt7915: add device id for mt7916")
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@...wei.com>
---
 drivers/net/wireless/mediatek/mt76/mt7915/pci.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/pci.c b/drivers/net/wireless/mediatek/mt76/mt7915/pci.c
index 728a879c3b00..3808ce1647d9 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/pci.c
@@ -65,10 +65,17 @@ static void mt7915_put_hif2(struct mt7915_hif *hif)
 
 static struct mt7915_hif *mt7915_pci_init_hif2(struct pci_dev *pdev)
 {
+	struct pci_dev *tmp_pdev;
+
 	hif_idx++;
-	if (!pci_get_device(PCI_VENDOR_ID_MEDIATEK, 0x7916, NULL) &&
-	    !pci_get_device(PCI_VENDOR_ID_MEDIATEK, 0x790a, NULL))
-		return NULL;
+
+	tmp_pdev = pci_get_device(PCI_VENDOR_ID_MEDIATEK, 0x7916, NULL);
+	if (!tmp_pdev) {
+		tmp_pdev = pci_get_device(PCI_VENDOR_ID_MEDIATEK, 0x790a, NULL);
+		if (!tmp_pdev)
+			return NULL;
+	}
+	pci_dev_put(tmp_pdev);
 
 	writel(hif_idx | MT_PCIE_RECOG_ID_SEM,
 	       pcim_iomap_table(pdev)[0] + MT_PCIE_RECOG_ID);
-- 
2.20.1