package/kernel/mwlwifi/patches/004-mwlwifi-fix-PCIe-DT-node-null-pointer-dereference.patch

   1 From 8e809b241695252e397bf0d7fc5f36e115c38831 Mon Sep 17 00:00:00 2001
   2 From: Robert Marko <robert.marko@sartura.hr>
   3 Date: Fri, 5 Mar 2021 11:47:59 +0100
   4 Subject: [PATCH] mwlwifi: fix PCIe DT node null pointer dereference
   5
   6 pci_bus_to_OF_node() used to get the PCI bus DT node
   7 returns node if found or NULL if none is found.
   8
   9 Since the return of pci_bus_to_OF_node() is not checked in
  10 the DT node name print it will cause a null pointer
  11 dereference and crash the kernel.
  12
  13 So first check whether the node is not NULL and then print.
  14
  15 Signed-off-by: Robert Marko <robert.marko@sartura.hr>
  16 ---
  17  hif/pcie/pcie.c | 3 ++-
  18  1 file changed, 2 insertions(+), 1 deletion(-)
  19
  20 --- a/hif/pcie/pcie.c
  21 +++ b/hif/pcie/pcie.c
  22 @@ -685,7 +685,8 @@ static struct device_node *pcie_get_devi
  23         struct device_node *dev_node;
  24
  25         dev_node = pci_bus_to_OF_node(pcie_priv->pdev->bus);
  26 -       wiphy_info(priv->hw->wiphy, "device node: %s\n", dev_node->full_name);
  27 +       if (dev_node)
  28 +               wiphy_info(priv->hw->wiphy, "device node: %s\n", dev_node->full_name);
  29
  30         return dev_node;
  31  }