From e2ef2c992354bd472a4d5c3e432f30854aef7bdb Mon Sep 17 00:00:00 2001
From: Katayama Hirofumi MZ <katayama.hirofumi.mz@gmail.com>
Date: Mon, 23 Mar 2026 22:43:33 +0900
Subject: [PATCH] [IMM32] ImmEnumInputContext: Validate hIMC (#8761)

Tougher system.
JIRA issue: CORE-19268
Check hIMC and gpsi in
ImmEnumInputContext function.
---
 win32ss/user/imm32/imm.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/win32ss/user/imm32/imm.c b/win32ss/user/imm32/imm.c
index f211a86cb87..ddacadf247b 100644
--- a/win32ss/user/imm32/imm.c
+++ b/win32ss/user/imm32/imm.c
@@ -1139,9 +1139,12 @@ ImmEnumInputContext(
     for (dwIndex = 0; dwIndex < dwCount; ++dwIndex)
     {
         hIMC = phList[dwIndex];
-        ret = (*lpfn)(hIMC, lParam);
-        if (!ret)
-            break;
+        if (hIMC && gpsi && ValidateHandle(hIMC, TYPE_INPUTCONTEXT))
+        {
+            ret = (*lpfn)(hIMC, lParam);
+            if (!ret)
+                break;
+        }
     }
 
     ImmLocalFree(phList);