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nfc: nci: fix the UAF of rf_conn_info object

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commit 1b1499a817 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@canonical.com>
Signed-off-by: Lin Ma <linma@zju.edu.cn>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lin Ma 2021-10-07 19:44:30 +02:00 committed by Greg Kroah-Hartman
parent 8f042315fc
commit 77c0ef979e
1 changed files with 2 additions and 0 deletions
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2
net/nfc/nci/rsp.c
View file

@ -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);
}
}