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Date:   Wed, 20 Oct 2021 20:22:31 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Lin Ma <linma@....edu.cn>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, kuba@...nel.org,
        bongsu.jeon@...sung.com, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 05/11] nfc: nci: fix the UAF of rf_conn_info object

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

[ Upstream commit 1b1499a817c90fd1ce9453a2c98d2a01cca0e775 ]

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>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 a48297b79f34..b0ed2b47ac43 100644
--- a/net/nfc/nci/rsp.c
+++ b/net/nfc/nci/rsp.c
@@ -277,6 +277,8 @@ 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);
 		}
 	}
-- 
2.33.0

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