[PATCH AUTOSEL 4.9 2/7] nfc: nci: fix the UAF of rf_conn_info object
From: Sasha Levin <sashal@kernel.org>
Date: 2021-10-21 00:25:22
Also in:
lkml, netdev
Subsystem:
networking [general], nfc subsystem, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Heidelberg, Linus Torvalds
From: Lin Ma <redacted> [ 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 <redacted> Signed-off-by: Lin Ma <redacted> Signed-off-by: Krzysztof Kozlowski <redacted> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.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 e3bbf1937d0e..7681f89dc312 100644
--- a/net/nfc/nci/rsp.c
+++ b/net/nfc/nci/rsp.c@@ -289,6 +289,8 @@ 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