[OE-core][scarthgap][PATCH 07/13] vim: Security Fix for CVE-2026-55892

[Siddharth <sdoshi@mvista.com>]

From: Siddharth Doshi <sdoshi@mvista.com>

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

References:
[1] https://nvd.nist.gov/vuln/detail/CVE-2026-55892
[2] https://security-tracker.debian.org/tracker/CVE-2026-55892

Signed-off-by: Siddharth Doshi <sdoshi@mvista.com>
---
 .../vim/files/CVE-2026-55892.patch            | 81 +++++++++++++++++++
 meta/recipes-support/vim/vim.inc              |  1 +
 2 files changed, 82 insertions(+)
 create mode 100644 meta/recipes-support/vim/files/CVE-2026-55892.patch

diff --git a/meta/recipes-support/vim/files/CVE-2026-55892.patch b/meta/recipes-support/vim/files/CVE-2026-55892.patch
new file mode 100644
index 0000000000..5f46c97cfa
--- /dev/null
+++ b/meta/recipes-support/vim/files/CVE-2026-55892.patch
@@ -0,0 +1,81 @@
+From f0df4a48a426bd67c0c2f5ad536000a4368cd4c0 Mon Sep 17 00:00:00 2001
+From: Yasuhiro Matsumoto <mattn.jp@gmail.com>
+Date: Tue, 16 Jun 2026 20:32:21 +0000
+Subject: [PATCH 10/17] patch 9.2.0662: [security] Stack out-of-bounds write in
+ dump_prefixes()
+
+Problem:  [security]: a crafted spell file with a self-referential
+          BY_INDEX node in the prefix tree can drive dump_prefixes()
+          past the end of its MAXWLEN-sized depth arrays on :spelldump
+          (cipher-creator)
+Solution: only descend while depth < MAXWLEN - 1, as the sibling trie
+          walkers already do (Yasuhiro Matsumoto)
+
+Github Security Advisory:
+https://github.com/vim/vim/security/advisories/GHSA-qm9w-fmpj-879h
+
+Supported by AI
+
+Signed-off-by: Yasuhiro Matsumoto <mattn.jp@gmail.com>
+Signed-off-by: Christian Brabandt <cb@256bit.org>
+
+Upstream-Status: Backport [https://github.com/vim/vim/commit/8325b193bba5f01e7a7d8241fc8633d93dff996b]
+CVE: CVE-2026-55892
+Signed-off-by: Siddharth Doshi <sdoshi@mvista.com>
+---
+ src/spell.c                |  2 +-
+ src/testdir/test_spell.vim | 27 +++++++++++++++++++++++++++
+ 2 files changed, 28 insertions(+), 1 deletion(-)
+
+diff --git a/src/spell.c b/src/spell.c
+index 2281986435..6ef3fa899b 100644
+--- a/src/spell.c
++++ b/src/spell.c
+@@ -4328,7 +4328,7 @@ dump_prefixes(
+ 			}
+ 		    }
+ 		}
+-		else
++		else if (depth < MAXWLEN - 1)
+ 		{
+ 		    // Normal char, go one level deeper.
+ 		    prefix[depth++] = c;
+diff --git a/src/testdir/test_spell.vim b/src/testdir/test_spell.vim
+index 170ea57926..2a3f0e3696 100644
+--- a/src/testdir/test_spell.vim
++++ b/src/testdir/test_spell.vim
+@@ -1567,4 +1567,31 @@ let g:test_data_aff_sal = [
+       \"SAL Z                    S",
+       \ ]
+ 
++" A crafted .spl with a self-referential BY_INDEX node in the PREFIXTREE drove
++" dump_prefixes() past its MAXWLEN-sized depth arrays (stack out-of-bounds
++" write).  The tree parses cleanly (shared refs aren't recursed); the walk
++" happens on :spelldump.  Reaching the assert means no OOB.  Same class as the
++" tree_count_words() fix (9.2.0653).
++func Test_spelldump_prefixtree_overflow()
++  CheckUnix
++  call mkdir('Xrtp/spell', 'pR')
++  " VIMspell + v50, SN_PREFCOND(prefixcnt=1), SN_END,
++  " LWORDTREE word "a" with affixID=1 (so dump_prefixes runs),
++  " empty KWORDTREE, PREFIXTREE child BY_INDEX -> nodeidx 0 (self-cycle), 'A'
++  let spl = eval('0z56494D7370656C6C32030000000003000100FF00000004'
++        \ .. '0161010220010000000000000002010100000041')
++  call writefile(spl, 'Xrtp/spell/xx.utf-8.spl', 'b')
++
++  new
++  set runtimepath+=./Xrtp
++  set spelllang=xx
++  set spell
++  spelldump
++  call assert_true(line('$') > 1)
++
++  set spell& spelllang& runtimepath&
++  bwipe!
++  bwipe!
++endfunc
++
+ " vim: shiftwidth=2 sts=2 expandtab
+-- 
+2.44.4
+
diff --git a/meta/recipes-support/vim/vim.inc b/meta/recipes-support/vim/vim.inc
index e867d4c1cd..64e3eab106 100644
--- a/meta/recipes-support/vim/vim.inc
+++ b/meta/recipes-support/vim/vim.inc
@@ -39,6 +39,7 @@ SRC_URI = "git://github.com/vim/vim.git;branch=master;protocol=https \
            file://CVE-2026-47162.patch \
            file://CVE-2026-47167.patch \
            file://CVE-2026-55693.patch \
+           file://CVE-2026-55892.patch \
            "
 
 PV .= ".1683"
-- 
2.34.1