[hardknott,4/4] qemu: fix CVE-2021-4206

diff --git a/meta/recipes-devtools/qemu/qemu.inc b/meta/recipes-devtools/qemu/qemu.inc
index 898377d11b..b6595a7731 100644
--- a/meta/recipes-devtools/qemu/qemu.inc
+++ b/meta/recipes-devtools/qemu/qemu.inc
@@ -81,6 +81,7 @@  SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \
            file://CVE-2021-3750_2.patch \
            file://CVE-2021-3750_3.patch \
            file://CVE-2022-26353.patch \
+           file://CVE-2021-4206.patch \
            "
 UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar"
 
diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2021-4206.patch b/meta/recipes-devtools/qemu/qemu/CVE-2021-4206.patch
new file mode 100644
index 0000000000..bc76d3a206
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/CVE-2021-4206.patch
@@ -0,0 +1,89 @@ 
+From 1ed7525cc9d9a98ef126e9803b09f50aa9f2e3bf Mon Sep 17 00:00:00 2001
+From: Mauro Matteo Cascella <mcascell@redhat.com>
+Date: Thu, 7 Apr 2022 10:17:12 +0200
+Subject: [PATCH] ui/cursor: fix integer overflow in cursor_alloc
+ (CVE-2021-4206)
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Prevent potential integer overflow by limiting 'width' and 'height' to
+512x512. Also change 'datasize' type to size_t. Refer to security
+advisory https://starlabs.sg/advisories/22-4206/ for more information.
+
+Fixes: CVE-2021-4206
+Signed-off-by: Mauro Matteo Cascella <mcascell@redhat.com>
+Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
+Message-Id: <20220407081712.345609-1-mcascell@redhat.com>
+Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
+
+CVE: CVE-2021-4206
+Upstream-Status: Backport [fa892e9abb728e76afcf27323ab29c57fb0fe7aa]
+
+Signed-off-by: Sakib Sajal <sakib.sajal@windriver.com>
+---
+ hw/display/qxl-render.c | 7 +++++++
+ hw/display/vmware_vga.c | 2 ++
+ ui/cursor.c             | 8 +++++++-
+ 3 files changed, 16 insertions(+), 1 deletion(-)
+
+diff --git a/hw/display/qxl-render.c b/hw/display/qxl-render.c
+index 3ce2e57b8..c2ecef706 100644
+--- a/hw/display/qxl-render.c
++++ b/hw/display/qxl-render.c
+@@ -246,6 +246,13 @@ static QEMUCursor *qxl_cursor(PCIQXLDevice *qxl, QXLCursor *cursor,
+     size_t size;
+ 
+     c = cursor_alloc(cursor->header.width, cursor->header.height);
++
++    if (!c) {
++        qxl_set_guest_bug(qxl, "%s: cursor %ux%u alloc error", __func__,
++                cursor->header.width, cursor->header.height);
++        goto fail;
++    }
++
+     c->hot_x = cursor->header.hot_spot_x;
+     c->hot_y = cursor->header.hot_spot_y;
+     switch (cursor->header.type) {
+diff --git a/hw/display/vmware_vga.c b/hw/display/vmware_vga.c
+index bef0d7d69..e30dbdcb3 100644
+--- a/hw/display/vmware_vga.c
++++ b/hw/display/vmware_vga.c
+@@ -510,6 +510,8 @@ static inline void vmsvga_cursor_define(struct vmsvga_state_s *s,
+     int i, pixels;
+ 
+     qc = cursor_alloc(c->width, c->height);
++    assert(qc != NULL);
++
+     qc->hot_x = c->hot_x;
+     qc->hot_y = c->hot_y;
+     switch (c->bpp) {
+diff --git a/ui/cursor.c b/ui/cursor.c
+index 1d62ddd4d..835f0802f 100644
+--- a/ui/cursor.c
++++ b/ui/cursor.c
+@@ -46,6 +46,8 @@ static QEMUCursor *cursor_parse_xpm(const char *xpm[])
+ 
+     /* parse pixel data */
+     c = cursor_alloc(width, height);
++    assert(c != NULL);
++
+     for (pixel = 0, y = 0; y < height; y++, line++) {
+         for (x = 0; x < height; x++, pixel++) {
+             idx = xpm[line][x];
+@@ -91,7 +93,11 @@ QEMUCursor *cursor_builtin_left_ptr(void)
+ QEMUCursor *cursor_alloc(int width, int height)
+ {
+     QEMUCursor *c;
+-    int datasize = width * height * sizeof(uint32_t);
++    size_t datasize = width * height * sizeof(uint32_t);
++
++    if (width > 512 || height > 512) {
++        return NULL;
++    }
+ 
+     c = g_malloc0(sizeof(QEMUCursor) + datasize);
+     c->width  = width;
+-- 
+2.33.0
+