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cirrus_vga: adding sanity check for vram size 

when configure a invalid vram size for cirrus card, such as less
2 MB, which will crash qemu. Follow the real hardware, the cirrus
card has 4 MB video memory. Also for backward compatibility, accept
8 MB and 16 MB vram size.

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gonglei 2014-05-12 15:10:38 +08:00 committed by Gerd Hoffmann
parent 9e99c5fd70
commit f61d82c2df
1 changed files with 16 additions and 0 deletions
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16
hw/display/cirrus_vga.c
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@ -2911,6 +2911,14 @@ static void isa_cirrus_vga_realizefn(DeviceState *dev, Error **errp)
ISACirrusVGAState *d = ISA_CIRRUS_VGA(dev);
VGACommonState *s = &d->cirrus_vga.vga;
/* follow real hardware, cirrus card emulated has 4 MB video memory.
Also accept 8 MB/16 MB for backward compatibility. */
if (s->vram_size_mb != 4 && s->vram_size_mb != 8 &&
s->vram_size_mb != 16) {
error_setg(errp, "Invalid cirrus_vga ram size '%u'",
s->vram_size_mb);
return;
}
vga_common_init(s, OBJECT(dev), true);
cirrus_init_common(&d->cirrus_vga, OBJECT(dev), CIRRUS_ID_CLGD5430, 0,
isa_address_space(isadev),
@ -2957,6 +2965,14 @@ static int pci_cirrus_vga_initfn(PCIDevice *dev)
PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev);
int16_t device_id = pc->device_id;
/* follow real hardware, cirrus card emulated has 4 MB video memory.
Also accept 8 MB/16 MB for backward compatibility. */
if (s->vga.vram_size_mb != 4 && s->vga.vram_size_mb != 8 &&
s->vga.vram_size_mb != 16) {
error_report("Invalid cirrus_vga ram size '%u'",
s->vga.vram_size_mb);
return -1;
}
/* setup VGA */
vga_common_init(&s->vga, OBJECT(dev), true);
cirrus_init_common(s, OBJECT(dev), device_id, 1, pci_address_space(dev),