File 0325-vga-fix-region-checks-in-wraparound.patch of Package qemu.29142

From: Gerd Hoffmann <kraxel@redhat.com>
Date: Mon, 30 Oct 2017 11:28:30 +0100
Subject: vga: fix region checks in wraparound case

Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-id: 20171030102830.4469-1-kraxel@redhat.com
(cherry picked from commit 115788d7a70e9ae255511ca00fc69cce06967472)
[BR: Support for BSC#1084604 (and other useful vga fixes)]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/display/vga.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/display/vga.c b/hw/display/vga.c
index 638b54a5d68a18c7768b7d69ef4e..ca42a7a7625128f03ed41c717df4 100644
--- a/hw/display/vga.c
+++ b/hw/display/vga.c
@@ -1690,9 +1690,9 @@ static void vga_draw_graphic(VGACommonState *s, int full_update)
             /* scanline wraps from end of video memory to the start */
             assert(force_shadow);
             update = memory_region_snapshot_get_dirty(&s->vram, snap,
-                                                      page0, 0);
+                                                      page0, s->vbe_size - page0);
             update |= memory_region_snapshot_get_dirty(&s->vram, snap,
-                                                       page1, 0);
+                                                       0, page1);
         } else {
             update = memory_region_snapshot_get_dirty(&s->vram, snap,
                                                       page0, page1 - page0);