From: Pan Bian <bianpan2...@163.com>

[ Upstream commit 91ec701a553cb3de470fd471c6fefe3ad1125455 ]

Function pci_find_ext_capability() may return 0, which is an invalid
address. In function qlcnic_sriov_virtid_fn(), its return value is used
without validation. This may result in invalid memory access bugs. This
patch fixes the bug.

Signed-off-by: Pan Bian <bianpan2...@163.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
---
 drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_common.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_common.c 
b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_common.c
index 1659c804f1d5..44e3cef336bd 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_common.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_common.c
@@ -126,6 +126,8 @@ static int qlcnic_sriov_virtid_fn(struct qlcnic_adapter 
*adapter, int vf_id)
                return 0;
 
        pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV);
+       if (!pos)
+               return 0;
        pci_read_config_word(dev, pos + PCI_SRIOV_VF_OFFSET, &offset);
        pci_read_config_word(dev, pos + PCI_SRIOV_VF_STRIDE, &stride);
 
-- 
2.14.1

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