This is a note to let you know that I've just added the patch titled nfc: nci: fix the UAF of rf_conn_info object to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: nfc-nci-fix-the-uaf-of-rf_conn_info-object.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 1b1499a817c90fd1ce9453a2c98d2a01cca0e775 Mon Sep 17 00:00:00 2001 From: Lin Ma <linma@xxxxxxxxxx> Date: Thu, 7 Oct 2021 19:44:30 +0200 Subject: nfc: nci: fix the UAF of rf_conn_info object From: Lin Ma <linma@xxxxxxxxxx> commit 1b1499a817c90fd1ce9453a2c98d2a01cca0e775 upstream. 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@xxxxxxxxxxxxx> Signed-off-by: Lin Ma <linma@xxxxxxxxxx> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/nfc/nci/rsp.c | 2 ++ 1 file changed, 2 insertions(+) --- a/net/nfc/nci/rsp.c +++ b/net/nfc/nci/rsp.c @@ -289,6 +289,8 @@ static void nci_core_conn_close_rsp_pack 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); } } Patches currently in stable-queue which might be from linma@xxxxxxxxxx are queue-4.9/nfc-nci-fix-the-uaf-of-rf_conn_info-object.patch