[PATCH 4.19 09/52] net: hns3: fix kernel crash when uninstalling driver

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Peiyang Wang <wangpeiyang1@huawei.com>

[ Upstream commit df3dff8ab6d79edc942464999d06fbaedf8cdd18 ]

When the driver is uninstalled and the VF is disabled concurrently, a
kernel crash occurs. The reason is that the two actions call function
pci_disable_sriov(). The num_VFs is checked to determine whether to
release the corresponding resources. During the second calling, num_VFs
is not 0 and the resource release function is called. However, the
corresponding resource has been released during the first invoking.
Therefore, the problem occurs:

[15277.839633][T50670] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020
...
[15278.131557][T50670] Call trace:
[15278.134686][T50670]  klist_put+0x28/0x12c
[15278.138682][T50670]  klist_del+0x14/0x20
[15278.142592][T50670]  device_del+0xbc/0x3c0
[15278.146676][T50670]  pci_remove_bus_device+0x84/0x120
[15278.151714][T50670]  pci_stop_and_remove_bus_device+0x6c/0x80
[15278.157447][T50670]  pci_iov_remove_virtfn+0xb4/0x12c
[15278.162485][T50670]  sriov_disable+0x50/0x11c
[15278.166829][T50670]  pci_disable_sriov+0x24/0x30
[15278.171433][T50670]  hnae3_unregister_ae_algo_prepare+0x60/0x90 [hnae3]
[15278.178039][T50670]  hclge_exit+0x28/0xd0 [hclge]
[15278.182730][T50670]  __se_sys_delete_module.isra.0+0x164/0x230
[15278.188550][T50670]  __arm64_sys_delete_module+0x1c/0x30
[15278.193848][T50670]  invoke_syscall+0x50/0x11c
[15278.198278][T50670]  el0_svc_common.constprop.0+0x158/0x164
[15278.203837][T50670]  do_el0_svc+0x34/0xcc
[15278.207834][T50670]  el0_svc+0x20/0x30

For details, see the following figure.

     rmmod hclge              disable VFs
----------------------------------------------------
hclge_exit()            sriov_numvfs_store()
  ...                     device_lock()
  pci_disable_sriov()     hns3_pci_sriov_configure()
                            pci_disable_sriov()
                              sriov_disable()
    sriov_disable()             if !num_VFs :
      if !num_VFs :               return;
        return;                 sriov_del_vfs()
      sriov_del_vfs()             ...
        ...                       klist_put()
        klist_put()               ...
        ...                     num_VFs = 0;
      num_VFs = 0;        device_unlock();

In this patch, when driver is removing, we get the device_lock()
to protect num_VFs, just like sriov_numvfs_store().

Fixes: 0dd8a25f355b ("net: hns3: disable sriov before unload hclge layer")
Signed-off-by: Peiyang Wang <wangpeiyang1@huawei.com>
Signed-off-by: Jijie Shao <shaojijie@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20241101091507.3644584-1-shaojijie@huawei.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/hisilicon/hns3/hnae3.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hnae3.c b/drivers/net/ethernet/hisilicon/hns3/hnae3.c
index b250d0fe9ac50..1265010f063fe 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hnae3.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hnae3.c
@@ -25,8 +25,11 @@ void hnae3_unregister_ae_algo_prepare(struct hnae3_ae_algo *ae_algo)
 		pci_id = pci_match_id(ae_algo->pdev_id_table, ae_dev->pdev);
 		if (!pci_id)
 			continue;
-		if (IS_ENABLED(CONFIG_PCI_IOV))
+		if (IS_ENABLED(CONFIG_PCI_IOV)) {
+			device_lock(&ae_dev->pdev->dev);
 			pci_disable_sriov(ae_dev->pdev);
+			device_unlock(&ae_dev->pdev->dev);
+		}
 	}
 }
 EXPORT_SYMBOL(hnae3_unregister_ae_algo_prepare);
-- 
2.43.0