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ati-vga: Fix check for blt outside vram 

Fix the check preventing calling pixman functions that would access
memory outside allocated vram. The r128 X driver sometimes seem to try
blits that span outside vram, this check prevents crashing QEMU in
that case. (The r128 X driver may have problems even on real hardware
so I'm not sure if it's a client bug or emulation problem but at least
QEMU should survive.)

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Tested-by: Andrew Randrianasulu <randrianasulu@gmail.com>
Message-Id: <20190409110732.5C5FF7465DB@zero.eik.bme.hu>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
BALATON Zoltan 2019-04-09 12:56:18 +02:00 committed by Gerd Hoffmann
parent 94932c95c1
commit 349ebdd76d
1 changed files with 6 additions and 6 deletions
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12
hw/display/ati_2d.c
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@ -79,10 +79,10 @@ void ati_2d_blt(ATIVGAState *s)
s->regs.dst_width, s->regs.dst_height);
end = s->vga.vram_ptr + s->vga.vram_size;
if (src_bits >= end || dst_bits >= end ||
src_bits + (s->regs.src_y + s->regs.dst_height) * src_stride +
s->regs.src_x >= end ||
dst_bits + (s->regs.dst_y + s->regs.dst_height) * dst_stride +
s->regs.dst_x >= end) {
src_bits + s->regs.src_x + (s->regs.src_y + s->regs.dst_height) *
src_stride * sizeof(uint32_t) >= end ||
dst_bits + s->regs.dst_x + (s->regs.dst_y + s->regs.dst_height) *
dst_stride * sizeof(uint32_t) >= end) {
qemu_log_mask(LOG_UNIMP, "blt outside vram not implemented\n");
return;
}
@ -140,8 +140,8 @@ void ati_2d_blt(ATIVGAState *s)
filler);
end = s->vga.vram_ptr + s->vga.vram_size;
if (dst_bits >= end ||
dst_bits + (s->regs.dst_y + s->regs.dst_height) * dst_stride +
s->regs.dst_x >= end) {
dst_bits + s->regs.dst_x + (s->regs.dst_y + s->regs.dst_height) *
dst_stride * sizeof(uint32_t) >= end) {
qemu_log_mask(LOG_UNIMP, "blt outside vram not implemented\n");
return;
}