1 files changed, 3 insertions, 1 deletions

diff --git a/arch/i386/pci/mmconfig.c b/arch/i386/pci/mmconfig.c
index 2002c741a383..f77d7f8b9bf6 100644
--- a/arch/i386/pci/mmconfig.c
+++ b/arch/i386/pci/mmconfig.c
@@ -80,8 +80,10 @@ static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
         unsigned long flags;
         u32 base;
 
-        if (!value || (bus > 255) || (devfn > 255) || (reg > 4095))
+        if (!value || (bus > 255) || (devfn > 255) || (reg > 4095)) {
+                *value = -1;
                 return -EINVAL;
+        }
 
         base = get_base_addr(seg, bus, devfn);
         if (!base)