From 9fd5f5b599e19c4485c3c7e6689081965e833df6 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Tue, 7 Feb 2017 10:07:50 +0100
Subject: [PATCH 6/8] cirrus: allow zero source pitch in pattern fill rops

RH-Author: Gerd Hoffmann <kraxel@redhat.com>
Message-id: <1486462072-32174-6-git-send-email-kraxel@redhat.com>
Patchwork-id: 73569
O-Subject: [RHEL-7.4 qemu-kvm PATCH 5/7] cirrus: allow zero source pitch in pattern fill rops
Bugzilla: 1418232
RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>

From: Wolfgang Bumiller <w.bumiller@proxmox.com>

The rops used by cirrus_bitblt_common_patterncopy only use
the destination pitch, so the source pitch shoul allowed to
be zero and the blit with used for the range check around the
source address.

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
Message-id: 1485272138-23249-1-git-send-email-w.bumiller@proxmox.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 5858dd1801883309bdd208d72ddb81c4e9fee30c)
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 hw/display/cirrus_vga.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/hw/display/cirrus_vga.c b/hw/display/cirrus_vga.c
index e09076a..b040ab1 100644
--- a/hw/display/cirrus_vga.c
+++ b/hw/display/cirrus_vga.c
@@ -267,9 +267,6 @@ static void cirrus_update_memory_access(CirrusVGAState *s);
 static bool blit_region_is_unsafe(struct CirrusVGAState *s,
                                   int32_t pitch, int32_t addr)
 {
-    if (!pitch) {
-        return true;
-    }
     if (pitch < 0) {
         int64_t min = addr
             + ((int64_t)s->cirrus_blt_height-1) * pitch;
@@ -289,8 +286,11 @@ static bool blit_region_is_unsafe(struct CirrusVGAState *s,
     return false;
 }
 
-static bool blit_is_unsafe(struct CirrusVGAState *s, bool dst_only)
+static bool blit_is_unsafe(struct CirrusVGAState *s, bool dst_only,
+                           bool zero_src_pitch_ok)
 {
+    int32_t check_pitch;
+
     /* should be the case, see cirrus_bitblt_start */
     assert(s->cirrus_blt_width > 0);
     assert(s->cirrus_blt_height > 0);
@@ -299,6 +299,10 @@ static bool blit_is_unsafe(struct CirrusVGAState *s, bool dst_only)
         return true;
     }
 
+    if (!s->cirrus_blt_dstpitch) {
+        return true;
+    }
+
     if (blit_region_is_unsafe(s, s->cirrus_blt_dstpitch,
                               s->cirrus_blt_dstaddr & s->cirrus_addr_mask)) {
         return true;
@@ -306,7 +310,13 @@ static bool blit_is_unsafe(struct CirrusVGAState *s, bool dst_only)
     if (dst_only) {
         return false;
     }
-    if (blit_region_is_unsafe(s, s->cirrus_blt_srcpitch,
+
+    check_pitch = s->cirrus_blt_srcpitch;
+    if (!zero_src_pitch_ok && !check_pitch) {
+        check_pitch = s->cirrus_blt_width;
+    }
+
+    if (blit_region_is_unsafe(s, check_pitch,
                               s->cirrus_blt_srcaddr & s->cirrus_addr_mask)) {
         return true;
     }
@@ -676,8 +686,9 @@ static int cirrus_bitblt_common_patterncopy(CirrusVGAState * s,
 
     dst = s->vga.vram_ptr + (s->cirrus_blt_dstaddr & s->cirrus_addr_mask);
 
-    if (blit_is_unsafe(s, false))
+    if (blit_is_unsafe(s, false, true)) {
         return 0;
+    }
 
     (*s->cirrus_rop) (s, dst, src,
                       s->cirrus_blt_dstpitch, 0,
@@ -694,7 +705,7 @@ static int cirrus_bitblt_solidfill(CirrusVGAState *s, int blt_rop)
 {
     cirrus_fill_t rop_func;
 
-    if (blit_is_unsafe(s, true)) {
+    if (blit_is_unsafe(s, true, true)) {
         return 0;
     }
     rop_func = cirrus_fill[rop_to_index[blt_rop]][s->cirrus_blt_pixelwidth - 1];
@@ -798,7 +809,7 @@ static int cirrus_do_copy(CirrusVGAState *s, int dst, int src, int w, int h)
 
 static int cirrus_bitblt_videotovideo_copy(CirrusVGAState * s)
 {
-    if (blit_is_unsafe(s, false))
+    if (blit_is_unsafe(s, false, false))
         return 0;
 
     return cirrus_do_copy(s, s->cirrus_blt_dstaddr - s->vga.start_addr,
-- 
1.8.3.1