File 0250-vga-add-vbe_enabled-helper.patch of Package qemu.3217

From cbdd6f7290e8298f69dbaa47aaa67e0fecb3ad56 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Tue, 26 Apr 2016 14:11:34 +0200
Subject: [PATCH] vga: add vbe_enabled() helper

Makes code a bit easier to read.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
[BR: BSC#978160 CVE-2016-3712]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/display/vga.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/hw/display/vga.c b/hw/display/vga.c
index bef5d40..eea3892 100644
--- a/hw/display/vga.c
+++ b/hw/display/vga.c
@@ -166,6 +166,11 @@ static uint32_t expand4[256];
 static uint16_t expand2[256];
 static uint8_t expand4to8[16];
 
+static inline bool vbe_enabled(VGACommonState *s)
+{
+    return s->vbe_regs[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED;
+}
+
 static void vga_update_memory_access(VGACommonState *s)
 {
     MemoryRegion *region, *old_region = s->chain4_alias;
@@ -589,7 +594,7 @@ static void vbe_fixup_regs(VGACommonState *s)
     uint16_t *r = s->vbe_regs;
     uint32_t bits, linelength, maxy, offset;
 
-    if (!(r[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED)) {
+    if (!vbe_enabled(s)) {
         /* vbe is turned off -- nothing to do */
         return;
     }
@@ -1232,7 +1237,7 @@ static void vga_get_offsets(VGACommonState *s,
 {
     uint32_t start_addr, line_offset, line_compare;
 
-    if (s->vbe_regs[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED) {
+    if (vbe_enabled(s)) {
         line_offset = s->vbe_line_offset;
         start_addr = s->vbe_start_addr;
         line_compare = 65535;
@@ -1721,7 +1726,7 @@ static int vga_get_bpp(VGACommonState *s)
 {
     int ret;
 
-    if (s->vbe_regs[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED) {
+    if (vbe_enabled(s)) {
         ret = s->vbe_regs[VBE_DISPI_INDEX_BPP];
     } else {
         ret = 0;
@@ -1733,7 +1738,7 @@ static void vga_get_resolution(VGACommonState *s, int *pwidth, int *pheight)
 {
     int width, height;
 
-    if (s->vbe_regs[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED) {
+    if (vbe_enabled(s)) {
         width = s->vbe_regs[VBE_DISPI_INDEX_XRES];
         height = s->vbe_regs[VBE_DISPI_INDEX_YRES];
     } else {