1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/pci/rom.c b/drivers/pci/rom.c
index 838575e3fac6..713c78f3a65d 100644
--- a/drivers/pci/rom.c
+++ b/drivers/pci/rom.c
@@ -125,7 +125,9 @@ void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size)
                 image += readw(pds + 16) * 512;
         } while (!last_image);
 
-        *size = image - rom;
+        /* never return a size larger than the PCI resource window */
+        /* there are known ROMs that get the size wrong */
+        *size = min((size_t)(image - rom), *size);
 
         return rom;
 }