vme: check for A64 overflow in vme_check_window()

Signed-off-by: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>
Cc: Igor Alekseev <igor.alekseev@itep.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/vme/vme.c b/drivers/vme/vme.c
index 6bab2c4ed77c9f8b0ba4335932203680aceb6af7..1b78d27aa72884cbea4ac92bd5f0c27d4ce5487c 100644 (file)
--- a/drivers/vme/vme.c
+++ b/drivers/vme/vme.c
@@ -199,10 +199,8 @@ static int vme_check_window(u32 aspace, unsigned long long vme_base,
                        retval = -EFAULT;
                break;
        case VME_A64:
-               /*
-                * Any value held in an unsigned long long can be used as the
-                * base
-                */
+               if ((size != 0) && (vme_base > U64_MAX + 1 - size))
+                       retval = -EFAULT;
                break;
        case VME_CRCSR:
                if (((vme_base + size) > VME_CRCSR_MAX) ||