fix CVE-2023-39128

(cherry picked from commit a2055ea3cefa92cfa677ad39f4c87dac7dec216e)

backport-CVE-2023-39128.patch

@@ -0,0 +1,71 @@
+From 033bc52bb6190393c8eed80925fa78cc35b40c6d Mon Sep 17 00:00:00 2001
+From: Tom Tromey <tromey@adacore.com>
+Date: Wed, 16 Aug 2023 11:29:19 -0600
+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 4a9a6e0f38f..2f934b1e79a 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"
+ #include "charset.h"
+@@ -1377,7 +1378,7 @@ ada_decode (const char *encoded, bool wrap, bool operators)
+ 	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;
+     }
+ 
+@@ -1574,6 +1575,18 @@ Suppress:
+   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
+@@ -13984,4 +13997,8 @@ 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
+ }
+-- 
+2.39.3
+

gdb.spec

@@ -1,6 +1,6 @@
 Name: gdb
 Version: 12.1
-Release: 6
+Release: 7
 
 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: https://ftp.gnu.org/gnu/gdb/gdb-%{version}.tar.xz
@@ -94,6 +94,7 @@ Patch81: gdb-Use-bool-for-evregpy_no_listeners_p.patch
 Patch82: gdb-Make-import-gdb.events-work.patch
 Patch83: gdb-Handle-Python-3.11-deprecation-of-PySys_SetPath-and-.patch
 Patch84: gdb-libctf-update-regexp-to-allow-makeinfo-to-build-docu.patch
+Patch85: backport-CVE-2023-39128.patch
 
 %global gdb_src gdb-%{version}
 %global gdb_build build-%{_target_platform}
@@ -369,6 +370,9 @@ rm -f $RPM_BUILD_ROOT%{_datadir}/gdb/python/gdb/command/backtrace.py
 %{_infodir}/ctf-spec.info.gz
 
 %changelog
+* Sat Sep 2 2023 liningjie <liningjie@xfusion.com> - 12.1-7
+- fix CVE-2023-39128
+
 * Thu Aug 3 2023 Wenyu Liu <liuwenyu7@huawei.com> - 12.1-6
 - libctf: update regexp to allow makeinfo to build document