From: Yang Yingliang yangyingliang@huawei.com

stable inclusion from stable-v5.10.164 commit 112df4cd2b09acd64bcd18f5ef83ba5d07b34bf0 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IALLC8 CVE: CVE-2022-48896

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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commit b93fb4405fcb5112c5739c5349afb52ec7f15c07 upstream.

As the comment of pci_get_domain_bus_and_slot() says, it returns a PCI device with refcount incremented, when finish using it, the caller must decrement the reference count by calling pci_dev_put().

In ixgbe_get_first_secondary_devfn() and ixgbe_x550em_a_has_mii(), pci_dev_put() is called to avoid leak.

Fixes: 8fa10ef01260 ("ixgbe: register a mdiobus") Signed-off-by: Yang Yingliang yangyingliang@huawei.com Tested-by: Gurucharan G gurucharanx.g@intel.com (A Contingent worker at Intel) Signed-off-by: Tony Nguyen anthony.l.nguyen@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Liu Jian liujian56@huawei.com --- drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c index fc389eecdd2b..b0413904b798 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c @@ -851,9 +851,11 @@ static struct pci_dev *ixgbe_get_first_secondary_devfn(unsigned int devfn) rp_pdev = pci_get_domain_bus_and_slot(0, 0, devfn); if (rp_pdev && rp_pdev->subordinate) { bus = rp_pdev->subordinate->number; + pci_dev_put(rp_pdev); return pci_get_domain_bus_and_slot(0, bus, 0); }

+ pci_dev_put(rp_pdev); return NULL; }

@@ -870,6 +872,7 @@ static bool ixgbe_x550em_a_has_mii(struct ixgbe_hw *hw) struct ixgbe_adapter *adapter = hw->back; struct pci_dev *pdev = adapter->pdev; struct pci_dev *func0_pdev; + bool has_mii = false;

/* For the C3000 family of SoCs (x550em_a) the internal ixgbe devices * are always downstream of root ports @ 0000:00:16.0 & 0000:00:17.0 @@ -880,15 +883,16 @@ static bool ixgbe_x550em_a_has_mii(struct ixgbe_hw *hw) func0_pdev = ixgbe_get_first_secondary_devfn(PCI_DEVFN(0x16, 0)); if (func0_pdev) { if (func0_pdev == pdev) - return true; - else - return false; + has_mii = true; + goto out; } func0_pdev = ixgbe_get_first_secondary_devfn(PCI_DEVFN(0x17, 0)); if (func0_pdev == pdev) - return true; + has_mii = true;

- return false; +out: + pci_dev_put(func0_pdev); + return has_mii; }

/**