[SPARC64]: check for possible NULL pointer dereference

This patch adds checking for possible NULL pointer dereference
if of_find_property() failed.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c
index 8c4875b..e587a37 100644 (file)
--- a/arch/sparc64/kernel/pci_sun4v.c
+++ b/arch/sparc64/kernel/pci_sun4v.c
@@ -1022,6 +1022,10 @@ void __init sun4v_pci_init(struct device_node *dp, char *model_name)
        }
 
        prop = of_find_property(dp, "reg", NULL);
+       if (!prop) {
+               prom_printf("SUN4V_PCI: Could not find config registers\n");
+               prom_halt();
+       }
        regs = prop->value;
 
        devhandle = (regs->phys_addr >> 32UL) & 0x0fffffff;