netdev - [PATCH] nfc: nci: fix the UAF of rf_conn

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Message-Id: <20211007174430.62558-1-krzysztof.kozlowski@canonical.com>
Date:   Thu,  7 Oct 2021 19:44:30 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Lin Ma <linma@....edu.cn>,
        linux-nfc@...ts.01.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Greg KH <greg@...ah.com>, Will Deacon <will@...nel.org>
Subject: [PATCH] nfc: nci: fix the UAF of rf_conn_info object

From: Lin Ma <linma@....edu.cn>

The nci_core_conn_close_rsp_packet() function will release the conn_info
with given conn_id. However, it needs to set the rf_conn_info to NULL to
prevent other routines like nci_rf_intf_activated_ntf_packet() to trigger
the UAF.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Signed-off-by: Lin Ma <linma@....edu.cn>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
---
 net/nfc/nci/rsp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/nfc/nci/rsp.c b/net/nfc/nci/rsp.c
index a2e72c003805..b911ab78bed9 100644
--- a/net/nfc/nci/rsp.c
+++ b/net/nfc/nci/rsp.c
@@ -334,6 +334,8 @@ static void nci_core_conn_close_rsp_packet(struct nci_dev *ndev,
 							 ndev->cur_conn_id);
 		if (conn_info) {
 			list_del(&conn_info->list);
+			if (conn_info == ndev->rf_conn_info)
+				ndev->rf_conn_info = NULL;
 			devm_kfree(&ndev->nfc_dev->dev, conn_info);
 		}
 	}
-- 
2.30.2