linux-kernel - [PATCH] wifi: iwlwifi: mvm: fix potential out-of-bounds read in iwl_mvm_nd_match_info

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Message-ID: <20260207150335.1013646-1-a.velichayshiy@ispras.ru>
Date: Sat,  7 Feb 2026 18:03:22 +0300
From: Alexey Velichayshiy <a.velichayshiy@...ras.ru>
To: a.velichayshiy@...ras.ru,
	Miri Korenblit <miriam.rachel.korenblit@...el.com>
Cc: Johannes Berg <johannes.berg@...el.com>,
	Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
	Pagadala Yesu Anjaneyulu <pagadala.yesu.anjaneyulu@...el.com>,
	linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org
Subject: [PATCH] wifi: iwlwifi: mvm: fix potential out-of-bounds read in iwl_mvm_nd_match_info_handler()

The memcpy function assumes the dynamic array notif->matches is at least
as large as the number of bytes to copy. Otherwise, results->matches may
contain unwanted data. To guarantee safety, extend the validation in one
of the checks to ensure sufficient packet length.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Alexey Velichayshiy <a.velichayshiy@...ras.ru>
---
 drivers/net/wireless/intel/iwlwifi/mvm/d3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c b/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
index 07f1a84c274e..c3ad414ac85e 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
@@ -2834,7 +2834,7 @@ static void iwl_mvm_nd_match_info_handler(struct iwl_mvm *mvm,
 	if (IS_ERR_OR_NULL(vif))
 		return;
 
-	if (len < sizeof(struct iwl_scan_offload_match_info)) {
+	if (len < sizeof(struct iwl_scan_offload_match_info) + matches_len) {
 		IWL_ERR(mvm, "Invalid scan match info notification\n");
 		return;
 	}
-- 
2.43.0