vim: Fix CVE-2026-25749

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

[1] https://github.com/vim/vim/commit/0714b15940b245108e6e9d7aa2260dd849a26fa9
[2] https://nvd.nist.gov/vuln/detail/CVE-2026-25749

(From OE-Core rev: ee5c47fdfed865ef7ddc18054cb6cebdb7b0e4cb)

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-2026-25749.patch

@@ -0,0 +1,64 @@
+From e0065a61a42bdff9c75aa18104f8ff546938395f Mon Sep 17 00:00:00 2001
+From: Christian Brabandt <cb@256bit.org>
+Date: Thu, 5 Feb 2026 18:51:54 +0000
+Subject: [PATCH] patch 9.1.2132: [security]: buffer-overflow in 'helpfile'
+ option handling
+
+Problem:  [security]: buffer-overflow in 'helpfile' option handling by
+          using strcpy without bound checks (Rahul Hoysala)
+Solution: Limit strncpy to the length of the buffer (MAXPATHL)
+
+Github Advisory:
+https://github.com/vim/vim/security/advisories/GHSA-5w93-4g67-mm43
+
+CVE: CVE-2026-25749
+Upstream-Status: Backport [https://github.com/vim/vim/commit/0714b15940b245108e6e9d7aa2260dd849a26fa9]
+
+Backport Changes:
+- Excluded changes to src/version.c and runtime/doc/version9.txt
+  from this backport. This file only tracks upstream version increments.
+  We are applying a security fix, not a version upgrade. These changes
+  were skipped to maintain current package versioning and avoid merge conflicts.
+
+Signed-off-by: Christian Brabandt <cb@256bit.org>
+(cherry picked from commit 0714b15940b245108e6e9d7aa2260dd849a26fa9)
+Signed-off-by: Anil Dongare <adongare@cisco.com>
+---
+ src/tag.c                 | 2 +-
+ src/testdir/test_help.vim | 9 +++++++++
+ 2 files changed, 10 insertions(+), 1 deletion(-)
+
+diff --git a/src/tag.c b/src/tag.c
+index 6912e8743..a32bbb245 100644
+--- a/src/tag.c
++++ b/src/tag.c
+@@ -3348,7 +3348,7 @@ get_tagfname(
+ 	    if (tnp->tn_hf_idx > tag_fnames.ga_len || *p_hf == NUL)
+ 		return FAIL;
+ 	    ++tnp->tn_hf_idx;
+-	    STRCPY(buf, p_hf);
++	    vim_strncpy(buf, p_hf, MAXPATHL - 1);
+ 	    STRCPY(gettail(buf), "tags");
+ #ifdef BACKSLASH_IN_FILENAME
+ 	    slash_adjust(buf);
+diff --git a/src/testdir/test_help.vim b/src/testdir/test_help.vim
+index dac153d86..f9e4686bb 100644
+--- a/src/testdir/test_help.vim
++++ b/src/testdir/test_help.vim
+@@ -222,4 +222,13 @@ func Test_helptag_navigation()
+ endfunc
+ 
+ 
++" This caused a buffer overflow
++func Test_helpfile_overflow()
++  let _helpfile = &helpfile
++  let &helpfile = repeat('A', 5000)
++  help
++  helpclose
++  let &helpfile = _helpfile
++endfunc
++
+ " vim: shiftwidth=2 sts=2 expandtab
+-- 
+2.43.7
+

meta/recipes-support/vim/vim.inc

@@ -17,6 +17,7 @@ SRC_URI = "git://github.com/vim/vim.git;branch=master;protocol=https \
            file://0001-src-Makefile-improve-reproducibility.patch \
            file://no-path-adjust.patch \
            file://CVE-2026-33412.patch \
+           file://CVE-2026-25749.patch \
            "
 
 PV .= ".1683"