From f046dadb4d56af207c36f7fc7db2c86b08bbda44 Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Mon, 9 Feb 2026 19:12:20 +0100
Subject: [PATCH] wifi: cfg80211: wext: fix IGTK key ID off-by-one

[ Upstream commit c8d7f21ead727485ebf965e2b4d42d4a4f0840f6 ]

The IGTK key ID must be 4 or 5, but the code checks against
key ID + 1, so must check against 5/6 rather than 4/5. Fix
that.

Reported-by: Jouni Malinen <j@w1.fi>
Fixes: 08645126dd24 ("cfg80211: implement wext key handling")
Link: https://patch.msgid.link/20260209181220.362205-2-johannes@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Ulrich Hecht <uli@kernel.org>
---
 net/wireless/wext-compat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/wireless/wext-compat.c b/net/wireless/wext-compat.c
index 4f0cfb8cc682..18f5dc80de10 100644
--- a/net/wireless/wext-compat.c
+++ b/net/wireless/wext-compat.c
@@ -677,7 +677,7 @@ static int cfg80211_wext_siwencodeext(struct net_device *dev,
 
 	idx = erq->flags & IW_ENCODE_INDEX;
 	if (cipher == WLAN_CIPHER_SUITE_AES_CMAC) {
-		if (idx < 4 || idx > 5) {
+		if (idx < 5 || idx > 6) {
 			idx = wdev->wext.default_mgmt_key;
 			if (idx < 0)
 				return -EINVAL;