diff --git a/backport-CVE-2023-39128.patch b/backport-CVE-2023-39128.patch
new file mode 100644
index 0000000000000000000000000000000000000000..27e89a103477976e91b82e4095a6a38a6f7cebf0
--- /dev/null
+++ b/backport-CVE-2023-39128.patch
@@ -0,0 +1,71 @@
+From c2596d1409817bc590f0f95f6a4b952f37198001 Mon Sep 17 00:00:00 2001
+From: liningjie <liningjie@xfusion.com>
+Date: Fri, 28 Jul 2023 13:25:11 +0800
+Subject: [PATCH] Avoid buffer overflow in ada_decode
+
+A bug report pointed out a buffer overflow in ada_decode, which Keith
+helpfully analyzed.  ada_decode had a logic error when the input was
+all digits.  While this isn't valid -- and would probably only appear
+in fuzzer tests -- it still should be handled properly.
+
+This patch adds a missing bounds check.  Tested with the self-tests in
+an asan build.
+
+Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30639
+Reviewed-by: Keith Seitz <keiths@redhat.com>
+---
+ gdb/ada-lang.c | 19 ++++++++++++++++++-
+ 1 file changed, 18 insertions(+), 1 deletion(-)
+
+diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
+index b098991..841901f 100644
+--- a/gdb/ada-lang.c
++++ b/gdb/ada-lang.c
+@@ -57,6 +57,7 @@
+ #include "cli/cli-utils.h"
+ #include "gdbsupport/function-view.h"
+ #include "gdbsupport/byte-vector.h"
++#include "gdbsupport/selftest.h"
+ #include <algorithm>
+ #include "ada-exp.h"
+ 
+@@ -1057,7 +1058,7 @@ ada_decode (const char *encoded, bool wrap)
+ 	i -= 1;
+       if (i > 1 && encoded[i] == '_' && encoded[i - 1] == '_')
+ 	len0 = i - 1;
+-      else if (encoded[i] == '$')
++      else if (i >= 0 && encoded[i] == '$')
+ 	len0 = i;
+     }
+ 
+@@ -1225,6 +1226,18 @@ ada_decode (const char *encoded, bool wrap)
+   return decoded;
+ }
+ 
++#ifdef GDB_SELF_TEST
++
++static void
++ada_decode_tests ()
++{
++  /* This isn't valid, but used to cause a crash.  PR gdb/30639.  The
++     result does not really matter very much.  */
++  SELF_CHECK (ada_decode ("44") == "44");
++}
++
++#endif
++
+ /* Table for keeping permanent unique copies of decoded names.  Once
+    allocated, names in this table are never released.  While this is a
+    storage leak, it should not be significant unless there are massive
+@@ -13497,4 +13510,8 @@ DWARF attribute."),
+   gdb::observers::new_objfile.attach (ada_new_objfile_observer, "ada-lang");
+   gdb::observers::free_objfile.attach (ada_free_objfile_observer, "ada-lang");
+   gdb::observers::inferior_exit.attach (ada_inferior_exit, "ada-lang");
++
++#ifdef GDB_SELF_TEST
++  selftests::register_test ("ada-decode", ada_decode_tests);
++#endif
+ }
+-- 
+2.33.0
+
diff --git a/gdb.spec b/gdb.spec
index af004d2003d37841722080e299632a3870edefd8..87c53d64cbd49667355ccad742a1a4454f7a37f1 100644
--- a/gdb.spec
+++ b/gdb.spec
@@ -1,6 +1,6 @@
 Name: gdb
 Version: 11.1
-Release: 4
+Release: 5
 
 License: GPLv3+ and GPLv3+ with exceptions and GPLv2+ and GPLv2+ with exceptions and GPL+ and LGPLv2+ and LGPLv3+ and BSD and Public Domain and GFDL-1.3
 Source: ftp://sourceware.org/pub/gdb/releases/gdb-%{version}.tar.xz
@@ -94,6 +94,7 @@ Patch81: gdb-rhbz2022177-dprintf-2.patch
 # Fedra patch end
 
 Patch82: 0001-Make-c-exp.y-work-with-Bison-3.8.patch
+Patch1000: backport-CVE-2023-39128.patch
 
 %ifarch loongarch64
 Patch83: 0001-gdb-Add-LoongArch-bfd-support.patch
@@ -378,6 +379,9 @@ rm -f $RPM_BUILD_ROOT%{_datadir}/gdb/python/gdb/command/backtrace.py
 %{_infodir}/gdb.info*
 
 %changelog
+* Sat Sep 2 2023 liningjie <liningjie@xfusion.com> - 11.1-5
+- fix CVE-2023-39128
+
 * Sun Apr 23 2023 yangchenguang <yangchenguang@kylinsec.com.cn> - 11.1-4
 - Sync 2203 loongarch64 support patch file