vim: Security Fix for CVE-2026-57455

Picking patch as per [1], and same patch is mentioned in [2]

References:
[1] https://nvd.nist.gov/vuln/detail/CVE-2026-57455
[2] https://security-tracker.debian.org/tracker/CVE-2026-57455

(From OE-Core rev: 91c8229fe73a22fdd07cec3db56fee2f281f1942)

Signed-off-by: Siddharth Doshi <sdoshi@mvista.com>
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/vim/files/CVE-2026-57455.patch

@@ -0,0 +1,72 @@
+From 497d2fb19b2af9bccf139bb910e4f91b583e769d Mon Sep 17 00:00:00 2001
+From: Christian Brabandt <cb@256bit.org>
+Date: Sun, 21 Jun 2026 19:20:03 +0000
+Subject: [PATCH 13/17] patch 9.2.0698: [security]: Out-of-bounds write with
+ soundfold()
+
+Problem:  [security]: Out-of-bounds write with soundfold()
+          (cipher-creator)
+Solution: Add an abort condition to the for loop to validate the buffer
+          size.
+
+Github Security Advisory:
+https://github.com/vim/vim/security/advisories/GHSA-q8mh-6qm3-25g4
+
+Supported by AI
+
+Signed-off-by: Christian Brabandt <cb@256bit.org>
+
+Upstream-Status: Backport [https://github.com/vim/vim/commit/497f931f85339d175d7f69588dd249e8ccfed41b]
+CVE: CVE-2026-57455
+Signed-off-by: Siddharth Doshi <sdoshi@mvista.com>
+---
+ src/spell.c                    |  2 +-
+ src/testdir/test_spellfile.vim | 21 +++++++++++++++++++++
+ 2 files changed, 22 insertions(+), 1 deletion(-)
+
+diff --git a/src/spell.c b/src/spell.c
+index 6ef3fa899b..a7909ef46e 100644
+--- a/src/spell.c
++++ b/src/spell.c
+@@ -3273,7 +3273,7 @@ spell_soundfold_sofo(slang_T *slang, char_u *inword, char_u *res)
+     else
+     {
+ 	// The sl_sal_first[] table contains the translation.
+-	for (s = inword; (c = *s) != NUL; ++s)
++	for (s = inword; (c = *s) != NUL && ri < MAXWLEN - 1; ++s)
+ 	{
+ 	    if (VIM_ISWHITE(c))
+ 		c = ' ';
+diff --git a/src/testdir/test_spellfile.vim b/src/testdir/test_spellfile.vim
+index e5f8c5778f..d04d024911 100644
+--- a/src/testdir/test_spellfile.vim
++++ b/src/testdir/test_spellfile.vim
+@@ -1193,4 +1193,25 @@ func Test_spell_sug_tree_count_words_overflow()
+   bwipe!
+ endfunc
+ 
++" A word longer than MAXWLEN must not overflow the soundfold result buffer in
++" the single-byte SOFO branch of spell_soundfold_sofo().
++func Test_soundfold_overflow()
++  let _enc=&enc
++  set enc=latin1
++  call writefile(['SOFOFROM ab', 'SOFOTO xy'], 'Xtest.aff', 'D')
++  call writefile(['1', 'foo'], 'Xtest.dic', 'D')
++  mkspell! Xtest Xtest
++  defer delete('Xtest.latin1.spl')
++  defer delete('Xtest.latin1.sug')
++  setl spelllang=Xtest.latin1.spl spell
++
++  " Before the fix the copy loop wrote one byte per input byte into a
++  " MAXWLEN (254) stack buffer with no upper bound, smashing the stack.
++  let sound = soundfold(repeat('ab', 300))
++  call assert_true(strlen(sound) < 254, 'soundfold result exceeds MAXWLEN')
++
++  set spell& spelllang&
++  let &enc = _enc
++endfunc
++
+ " vim: shiftwidth=2 sts=2 expandtab
+-- 
+2.44.4
+

meta/recipes-support/vim/vim.inc

@@ -45,6 +45,7 @@ SRC_URI = "git://github.com/vim/vim.git;branch=master;protocol=https \
            file://CVE-2026-55892.patch \
            file://CVE-2026-55895.patch \
            file://CVE-2026-57452.patch \
+           file://CVE-2026-57455.patch \
            "
 
 PV .= ".1683"