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From 46aff2c7e91ef9f372ad38ba5e90c42b9b27ac75 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Tue, 26 Apr 2016 14:11:34 +0200
Subject: [PATCH 1/4] vga: add vbe_enabled() helper
Makes code a bit easier to read.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Upstream-Status: Backport
CVE: CVE-2016-3712 patch1
Signed-off-by: Armin Kuster <akuster@mvista.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 442fee9..cc1a682 100644
--- a/hw/display/vga.c
+++ b/hw/display/vga.c
@@ -140,6 +140,11 @@ 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)
{
hwaddr base, offset, size;
@@ -562,7 +567,7 @@ 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;
}
@@ -1056,7 +1061,7 @@ 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;
@@ -1381,7 +1386,7 @@ 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;
@@ -1393,7 +1398,7 @@ 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 {
--
2.7.4
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