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From f9b9adc4b66f991e655f51f2ef67dac46f6bd7d4 Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Mon, 27 Mar 2017 10:01:16 +0200
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Subject: [PATCH 1/7] fix :cirrus_vga fix OOB read case qemu Segmentation fault
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RH-Author: Gerd Hoffmann <kraxel@redhat.com>
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Message-id: <1490608882-10242-2-git-send-email-kraxel@redhat.com>
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Patchwork-id: 74553
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O-Subject: [RHEL-7.4 qemu-kvm PATCH v2 1/7] fix :cirrus_vga fix OOB read case qemu Segmentation fault
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Bugzilla: 1430060
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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: Paolo Bonzini <pbonzini@redhat.com>
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From: hangaohuai <hangaohuai@huawei.com>
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check the validity of parameters in cirrus_bitblt_rop_fwd_transp_xxx
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and cirrus_bitblt_rop_fwd_xxx to avoid the OOB read which causes qemu Segmentation fault.
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After the fix, we will touch the assert in
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cirrus_invalidate_region:
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assert(off_cur_end >= off_cur);
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Signed-off-by: fangying <fangying1@huawei.com>
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Signed-off-by: hangaohuai <hangaohuai@huawei.com>
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Message-id: 20170314063919.16200-1-hangaohuai@huawei.com
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit 215902d7b6fb50c6fc216fc74f770858278ed904)
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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 | 10 ++++++++++
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1 file changed, 10 insertions(+)
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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 9c7bb09..a4f96c6 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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@@ -98,6 +98,11 @@ glue(glue(cirrus_bitblt_rop_fwd_transp_, ROP_NAME),_8)(CirrusVGAState *s,
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uint8_t p;
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dstpitch -= bltwidth;
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srcpitch -= bltwidth;
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+
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+ if (bltheight > 1 && (dstpitch < 0 || srcpitch < 0)) {
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+ return;
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+ }
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+
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for (y = 0; y < bltheight; y++) {
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for (x = 0; x < bltwidth; x++) {
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p = *dst;
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@@ -144,6 +149,11 @@ glue(glue(cirrus_bitblt_rop_fwd_transp_, ROP_NAME),_16)(CirrusVGAState *s,
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uint8_t p1, p2;
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dstpitch -= bltwidth;
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srcpitch -= bltwidth;
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+
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+ if (bltheight > 1 && (dstpitch < 0 || srcpitch < 0)) {
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+ return;
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+ }
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+
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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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p1 = *dst;
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--
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1.8.3.1
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