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ati-vga: Do not allow unaligned access via index register

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According to docs bits 1 and 0 of MM_INDEX are hard coded to 0 so
unaligned access via this register should not be possible.
This also fixes problems reported in bug #1878134.

Buglink: https://bugs.launchpad.net/qemu/+bug/1878134
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Tested-by: Alexander Bulekov <alxndr@bu.edu>
Acked-by: Alexander Bulekov <alxndr@bu.edu>
Message-id: 20200516132352.39E9374594E@zero.eik.bme.hu
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
BALATON Zoltan 2020-05-16 15:13:03 +02:00 committed by Gerd Hoffmann
parent debe78ce14
commit b0588cb51d
1 changed files with 1 additions and 1 deletions
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2
hw/display/ati.c
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@ -511,7 +511,7 @@ static void ati_mm_write(void *opaque, hwaddr addr,
}
switch (addr) {
case MM_INDEX:
s->regs.mm_index = data;
s->regs.mm_index = data & ~3;
break;
case MM_DATA ... MM_DATA + 3:
/* indexed access to regs or memory */