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From 8c2a803f9ba8b4293c207917a2acfcfac0548d24 Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Tue, 21 Mar 2017 09:58:07 +0100
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Subject: [PATCH 7/7] cirrus: fix off-by-one in
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cirrus_bitblt_rop_bkwd_transp_*_16
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Gerd Hoffmann <kraxel@redhat.com>
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Message-id: <1490090287-1503-8-git-send-email-kraxel@redhat.com>
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Patchwork-id: 74422
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O-Subject: [RHEL-7.4 qemu-kvm PATCH 7/7] cirrus: fix off-by-one in cirrus_bitblt_rop_bkwd_transp_*_16
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Bugzilla: 1430059
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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The switch from pointers to addresses (commit
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026aeffcb4752054830ba203020ed6eb05bcaba8 and
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ffaf857778286ca54e3804432a2369a279e73aa7) added
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a off-by-one bug to 16bit backward blits. Fix.
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Reported-by: 李强 <liqiang6-s@360.cn>
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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Reviewed-by: Li Qiang <liqiang6-s@360.cn>
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Message-id: 1489735296-19047-1-git-send-email-kraxel@redhat.com
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(cherry picked from commit f019722cbbb45aea153294fc8921fcc96a4d3fa2)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/display/cirrus_vga_rop.h | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/hw/display/cirrus_vga_rop.h b/hw/display/cirrus_vga_rop.h
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index 16dffb8..c1fc070 100644
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--- a/hw/display/cirrus_vga_rop.h
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+++ b/hw/display/cirrus_vga_rop.h
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@@ -220,7 +220,7 @@ glue(glue(cirrus_bitblt_rop_bkwd_transp_, ROP_NAME),_16)(CirrusVGAState *s,
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srcpitch += bltwidth;
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for (y = 0; y < bltheight; y++) {
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for (x = 0; x < bltwidth; x+=2) {
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- ROP_OP_TR_16(s, dstaddr, cirrus_src16(s, srcaddr), transp);
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+ ROP_OP_TR_16(s, dstaddr - 1, cirrus_src16(s, srcaddr - 1), transp);
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dstaddr -= 2;
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srcaddr -= 2;
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}
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--
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1.8.3.1
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