vim: Fix CVE-2026-28418

Pick patch from [1] also mentioned in [2]

[1] https://github.com/vim/vim/commit/f6a7f469a9c0d09e84cd6cb46c3a9e76f684da2d
[2] https://nvd.nist.gov/vuln/detail/CVE-2026-28418

(From OE-Core rev: 8cadabb525aa1ea57aa0316240ac8f9ec09161d9)

Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Paul Barker <paul@pbarker.dev>

meta/recipes-support/vim/files/CVE-2026-28418.patch

@@ -0,0 +1,78 @@
+From f6a7f469a9c0d09e84cd6cb46c3a9e76f684da2d Mon Sep 17 00:00:00 2001
+From: Christian Brabandt <cb@256bit.org>
+Date: Mon, 23 Feb 2026 18:30:11 +0000
+Subject: [PATCH] patch 9.2.0074: [security]: Crash with overlong emacs tag
+ file
+
+Problem:  Crash with overlong emacs tag file, because of an OOB buffer
+          read (ehdgks0627, un3xploitable)
+Solution: Check for end of buffer and return early.
+
+Github Advisory:
+https://github.com/vim/vim/security/advisories/GHSA-h4mf-vg97-hj8j
+
+Signed-off-by: Christian Brabandt <cb@256bit.org>
+
+CVE: CVE-2026-28418
+Upstream-Status: Backport [https://github.com/vim/vim/commit/f6a7f469a9c0d09e84cd6cb46c3a9e76f684da2d]
+Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
+---
+ src/tag.c                    |  3 +++
+ src/testdir/test_taglist.vim | 15 +++++++++++++++
+ src/version.c                |  2 ++
+ 3 files changed, 20 insertions(+)
+
+diff --git a/src/tag.c b/src/tag.c
+index a32bbb2459..45af67f20d 100644
+--- a/src/tag.c
++++ b/src/tag.c
+@@ -1902,6 +1902,9 @@ emacs_tags_new_filename(findtags_state_T *st)
+ 
+     for (p = st->ebuf; *p && *p != ','; p++)
+ 	;
++    // invalid
++    if (*p == NUL)
++	return;
+     *p = NUL;
+ 
+     // check for an included tags file.
+diff --git a/src/testdir/test_taglist.vim b/src/testdir/test_taglist.vim
+index 5a946042be..506e64f7ae 100644
+--- a/src/testdir/test_taglist.vim
++++ b/src/testdir/test_taglist.vim
+@@ -301,4 +301,19 @@ func Test_tag_complete_with_overlong_line()
+   set tags&
+ endfunc
+ 
++" This used to crash Vim
++func Test_evil_emacs_tagfile()
++  CheckFeature emacs_tags
++  let longline = repeat('a', 515)
++  call writefile([
++	\ "\x0c",
++	\ longline
++	\ ], 'Xtags', 'D')
++  set tags=Xtags
++
++  call assert_fails(':tag a', 'E426:')
++
++  set tags&
++endfunc
++
+ " vim: shiftwidth=2 sts=2 expandtab
+diff --git a/src/version.c b/src/version.c
+index 712a3e637c..7d265ab641 100644
+--- a/src/version.c
++++ b/src/version.c
+@@ -724,6 +724,8 @@ static char *(features[]) =
+ 
+ static int included_patches[] =
+ {   /* Add new patch number below this line */
++/**/
++    1685,
+ /**/
+     1684,
+ /**/
+-- 
+2.50.1
+

meta/recipes-support/vim/vim.inc

@@ -19,6 +19,7 @@ SRC_URI = "git://github.com/vim/vim.git;branch=master;protocol=https \
            file://CVE-2026-33412.patch \
            file://CVE-2026-25749.patch \
            file://CVE-2026-26269.patch \
+           file://CVE-2026-28418.patch \
            "
 
 PV .= ".1683"