diff --git a/backport-CVE-2021-3782.patch b/backport-CVE-2021-3782.patch
new file mode 100644
index 0000000..5fc8274
--- /dev/null
+++ b/backport-CVE-2021-3782.patch
@@ -0,0 +1,106 @@
+From b19488c7154b902354cb26a27f11415d7799b0b2 Mon Sep 17 00:00:00 2001
+From: Derek Foreman <derek.foreman@collabora.com>
+Date: Fri, 28 Jan 2022 13:18:37 -0600
+Subject: [PATCH] util: Limit size of wl_map
+
+Since server IDs are basically indistinguishable from really big client
+IDs at many points in the source, it's theoretically possible to overflow
+a map and either overflow server IDs into the client ID space, or grow
+client IDs into the server ID space. This would currently take a massive
+amount of RAM, but the definition of massive changes yearly.
+
+Prevent this by placing a ridiculous but arbitrary upper bound on the
+number of items we can put in a map: 0xF00000, somewhere over 15 million.
+This should satisfy pathological clients without restriction, but stays
+well clear of the 0xFF000000 transition point between server and client
+IDs. It will still take an improbable amount of RAM to hit this, and a
+client could still exhaust all RAM in this way, but our goal is to prevent
+overflow and undefined behaviour.
+
+Fixes #224
+
+Signed-off-by: Derek Foreman <derek.foreman@collabora.com>
+
+Conflict:NA
+Reference:https://gitlab.freedesktop.org/wayland/wayland/-/commit/b19488c7154b902354cb26a27f11415d7799b0b2
+---
+ src/wayland-private.h |  1 +
+ src/wayland-util.c    | 25 +++++++++++++++++++++++--
+ 2 files changed, 24 insertions(+), 2 deletions(-)
+
+diff --git a/src/wayland-private.h b/src/wayland-private.h
+index 210451e..9274f1b 100644
+--- a/src/wayland-private.h
++++ b/src/wayland-private.h
+@@ -45,6 +45,7 @@
+ #define WL_MAP_SERVER_SIDE 0
+ #define WL_MAP_CLIENT_SIDE 1
+ #define WL_SERVER_ID_START 0xff000000
++#define WL_MAP_MAX_OBJECTS 0x00f00000
+ #define WL_CLOSURE_MAX_ARGS 20
+ 
+ struct wl_object {
+diff --git a/src/wayland-util.c b/src/wayland-util.c
+index c89a67b..997a2c7 100644
+--- a/src/wayland-util.c
++++ b/src/wayland-util.c
+@@ -197,6 +197,7 @@ wl_map_insert_new(struct wl_map *map, uint32_t flags, void *data)
+ 	union map_entry *start, *entry;
+ 	struct wl_array *entries;
+ 	uint32_t base;
++	uint32_t count;
+ 
+ 	if (map->side == WL_MAP_CLIENT_SIDE) {
+ 		entries = &map->client_entries;
+@@ -217,10 +218,25 @@ wl_map_insert_new(struct wl_map *map, uint32_t flags, void *data)
+ 		start = entries->data;
+ 	}
+ 
++	/* wl_array only grows, so if we have too many objects at
++	 * this point there's no way to clean up. We could be more
++	 * pro-active about trying to avoid this allocation, but
++	 * it doesn't really matter because at this point there is
++	 * nothing to be done but disconnect the client and delete
++	 * the whole array either way.
++	 */
++	count = entry - start;
++	if (count > WL_MAP_MAX_OBJECTS) {
++		/* entry->data is freshly malloced garbage, so we'd
++		 * better make it a NULL so wl_map_for_each doesn't
++		 * dereference it later. */
++		entry->data = NULL;
++		return 0;
++	}
+ 	entry->data = data;
+ 	entry->next |= (flags & 0x1) << 1;
+ 
+-	return (entry - start) + base;
++	return count + base;
+ }
+ 
+ int
+@@ -237,6 +253,9 @@ wl_map_insert_at(struct wl_map *map, uint32_t flags, uint32_t i, void *data)
+ 		i -= WL_SERVER_ID_START;
+ 	}
+ 
++	if (i > WL_MAP_MAX_OBJECTS)
++		return -1;
++
+ 	count = entries->size / sizeof *start;
+ 	if (count < i)
+ 		return -1;
+@@ -271,8 +290,10 @@ wl_map_reserve_new(struct wl_map *map, uint32_t i)
+ 		i -= WL_SERVER_ID_START;
+ 	}
+ 
+-	count = entries->size / sizeof *start;
++	if (i > WL_MAP_MAX_OBJECTS)
++		return -1;
+ 
++	count = entries->size / sizeof *start;
+ 	if (count < i)
+ 		return -1;
+ 
+-- 
+2.33.0
+
diff --git a/wayland.spec b/wayland.spec
index bb2315e..312d740 100644
--- a/wayland.spec
+++ b/wayland.spec
@@ -1,11 +1,13 @@
 Name:           wayland
 Version:        1.20.0
-Release:	5
+Release:	6
 Summary:	Wayland Compositor Infrastructure
 License:	MIT
 URL:		http://wayland.freedesktop.org/
 Source0:	http://wayland.freedesktop.org/releases/%{name}-%{version}.tar.xz
 
+Patch6000:	backport-CVE-2021-3782.patch
+
 BuildRequires:  gcc gcc-c++ docbook-style-xsl doxygen expat-devel  
 BuildRequires:  libxml2-devel libxslt pkgconfig(libffi) xmlto graphviz meson
 
@@ -91,6 +93,9 @@ developing applications that use %{name}.
 %{_datadir}/doc/wayland/
 
 %changelog
+* Wed Sep 14 2022 wangkerong <wangkerong@h-partners.com> - 1.20.0-6
+- fix CVE-2021-3782
+
 * Wed Aug 03 2022 wangkerong <wangkerong@h-partners.com> - 1.20.0-5
 - revert remove rpath