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From abfd9c2acaf70c60ec70807ba4d021ade69c7b79 Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Fri, 10 Feb 2017 08:30:14 +0100
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Subject: [PATCH 2/3] Revert "cirrus: allow zero source pitch in pattern fill
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rops"
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RH-Author: Gerd Hoffmann <kraxel@redhat.com>
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Message-id: <1486715415-3462-3-git-send-email-kraxel@redhat.com>
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Patchwork-id: 73774
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O-Subject: [virt-devel] [RHEL-7.4 qemu-kvm PATCH 2/3] Revert "cirrus: allow zero source pitch in pattern fill rops"
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Bugzilla: 1420492
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CVE: CVE-2017-2620/20170221
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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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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This reverts commit 5858dd1801883309bdd208d72ddb81c4e9fee30c.
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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Conflicts:
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hw/display/cirrus_vga.c
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Cc: Wolfgang Bumiller <w.bumiller@proxmox.com>
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Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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Upstream: WIP (https://patchwork.ozlabs.org/patch/726074/)
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---
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hw/display/cirrus_vga.c | 26 ++++++++------------------
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1 file changed, 8 insertions(+), 18 deletions(-)
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diff --git a/hw/display/cirrus_vga.c b/hw/display/cirrus_vga.c
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index fff9bf0..9a9501f 100644
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--- a/hw/display/cirrus_vga.c
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+++ b/hw/display/cirrus_vga.c
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@@ -267,6 +267,9 @@ static void cirrus_update_memory_access(CirrusVGAState *s);
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static bool blit_region_is_unsafe(struct CirrusVGAState *s,
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int32_t pitch, int32_t addr)
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{
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+ if (!pitch) {
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+ return true;
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+ }
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if (pitch < 0) {
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int64_t min = addr
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+ ((int64_t)s->cirrus_blt_height - 1) * pitch
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@@ -285,11 +288,8 @@ static bool blit_region_is_unsafe(struct CirrusVGAState *s,
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return false;
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}
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-static bool blit_is_unsafe(struct CirrusVGAState *s, bool dst_only,
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- bool zero_src_pitch_ok)
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+static bool blit_is_unsafe(struct CirrusVGAState *s, bool dst_only)
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{
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- int32_t check_pitch;
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-
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/* should be the case, see cirrus_bitblt_start */
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assert(s->cirrus_blt_width > 0);
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assert(s->cirrus_blt_height > 0);
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@@ -298,10 +298,6 @@ static bool blit_is_unsafe(struct CirrusVGAState *s, bool dst_only,
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return true;
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}
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- if (!s->cirrus_blt_dstpitch) {
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- return true;
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- }
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-
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if (blit_region_is_unsafe(s, s->cirrus_blt_dstpitch,
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s->cirrus_blt_dstaddr)) {
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return true;
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@@ -309,13 +305,7 @@ static bool blit_is_unsafe(struct CirrusVGAState *s, bool dst_only,
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if (dst_only) {
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return false;
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}
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-
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- check_pitch = s->cirrus_blt_srcpitch;
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- if (!zero_src_pitch_ok && !check_pitch) {
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- check_pitch = s->cirrus_blt_width;
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- }
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-
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- if (blit_region_is_unsafe(s, check_pitch,
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+ if (blit_region_is_unsafe(s, s->cirrus_blt_srcpitch,
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s->cirrus_blt_srcaddr)) {
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return true;
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}
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@@ -710,7 +700,7 @@ static int cirrus_bitblt_common_patterncopy(CirrusVGAState *s, bool videosrc)
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src = s->cirrus_bltbuf;
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}
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- if (blit_is_unsafe(s, true, true)) {
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+ if (blit_is_unsafe(s, true)) {
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return 0;
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}
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@@ -729,7 +719,7 @@ static int cirrus_bitblt_solidfill(CirrusVGAState *s, int blt_rop)
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{
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cirrus_fill_t rop_func;
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- if (blit_is_unsafe(s, true, true)) {
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+ if (blit_is_unsafe(s, true)) {
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return 0;
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}
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rop_func = cirrus_fill[rop_to_index[blt_rop]][s->cirrus_blt_pixelwidth - 1];
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@@ -829,7 +819,7 @@ static int cirrus_do_copy(CirrusVGAState *s, int dst, int src, int w, int h)
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static int cirrus_bitblt_videotovideo_copy(CirrusVGAState * s)
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{
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- if (blit_is_unsafe(s, false, false))
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+ if (blit_is_unsafe(s, false))
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return 0;
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return cirrus_do_copy(s, s->cirrus_blt_dstaddr - s->vga.start_addr,
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--
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1.8.3.1
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