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[71.56.157.77]) by smtp.gmail.com with ESMTPSA id j13sm21001739pfc.151.2021.11.30.16.03.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Nov 2021 16:03:05 -0800 (PST) From: Luiz Augusto von Dentz To: davem@davemloft.net, kuba@kernel.org Cc: linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org, dan.carpenter@oracle.com, Luiz Augusto von Dentz Subject: [PATCH 08/15] Bluetooth: HCI: Use skb_pull_data to parse LE Metaevents Date: Tue, 30 Nov 2021 16:02:08 -0800 Message-Id: <20211201000215.1134831-9-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211201000215.1134831-1-luiz.dentz@gmail.com> References: <20211201000215.1134831-1-luiz.dentz@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Luiz Augusto von Dentz This uses skb_pull_data to check the LE Metaevents received have the minimum required length. Signed-off-by: Luiz Augusto von Dentz --- net/bluetooth/hci_event.c | 75 +++++++++++++++++++++++++++++++++------ 1 file changed, 64 insertions(+), 11 deletions(-) diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index 89c263c1883f..d30e77f66376 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -69,6 +69,18 @@ static void *hci_cc_skb_pull(struct hci_dev *hdev, struct sk_buff *skb, return data; } +static void *hci_le_ev_skb_pull(struct hci_dev *hdev, struct sk_buff *skb, + u8 ev, size_t len) +{ + void *data; + + data = skb_pull_data(skb, len); + if (!data) + bt_dev_err(hdev, "Malformed LE Event: 0x%2.2x", ev); + + return data; +} + static void hci_cc_inquiry_cancel(struct hci_dev *hdev, struct sk_buff *skb, u8 *new_status) { @@ -6119,7 +6131,12 @@ static void le_conn_complete_evt(struct hci_dev *hdev, u8 status, static void hci_le_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb) { - struct hci_ev_le_conn_complete *ev = (void *) skb->data; + struct hci_ev_le_conn_complete *ev; + + ev = hci_le_ev_skb_pull(hdev, skb, HCI_EV_LE_CONN_COMPLETE, + sizeof(*ev)); + if (!ev) + return; BT_DBG("%s status 0x%2.2x", hdev->name, ev->status); @@ -6133,7 +6150,12 @@ static void hci_le_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb) static void hci_le_enh_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb) { - struct hci_ev_le_enh_conn_complete *ev = (void *) skb->data; + struct hci_ev_le_enh_conn_complete *ev; + + ev = hci_le_ev_skb_pull(hdev, skb, HCI_EV_LE_ENHANCED_CONN_COMPLETE, + sizeof(*ev)); + if (!ev) + return; BT_DBG("%s status 0x%2.2x", hdev->name, ev->status); @@ -6146,10 +6168,15 @@ static void hci_le_enh_conn_complete_evt(struct hci_dev *hdev, static void hci_le_ext_adv_term_evt(struct hci_dev *hdev, struct sk_buff *skb) { - struct hci_evt_le_ext_adv_set_term *ev = (void *) skb->data; + struct hci_evt_le_ext_adv_set_term *ev; struct hci_conn *conn; struct adv_info *adv, *n; + ev = hci_le_ev_skb_pull(hdev, skb, HCI_EV_LE_EXT_ADV_SET_TERM, + sizeof(*ev)); + if (!ev) + return; + BT_DBG("%s status 0x%2.2x", hdev->name, ev->status); adv = hci_find_adv_instance(hdev, ev->handle); @@ -6211,9 +6238,14 @@ static void hci_le_ext_adv_term_evt(struct hci_dev *hdev, struct sk_buff *skb) static void hci_le_conn_update_complete_evt(struct hci_dev *hdev, struct sk_buff *skb) { - struct hci_ev_le_conn_update_complete *ev = (void *) skb->data; + struct hci_ev_le_conn_update_complete *ev; struct hci_conn *conn; + ev = hci_le_ev_skb_pull(hdev, skb, HCI_EV_LE_CONN_UPDATE_COMPLETE, + sizeof(*ev)); + if (!ev) + return; + BT_DBG("%s status 0x%2.2x", hdev->name, ev->status); if (ev->status) @@ -6636,9 +6668,14 @@ static void hci_le_ext_adv_report_evt(struct hci_dev *hdev, struct sk_buff *skb) static void hci_le_remote_feat_complete_evt(struct hci_dev *hdev, struct sk_buff *skb) { - struct hci_ev_le_remote_feat_complete *ev = (void *)skb->data; + struct hci_ev_le_remote_feat_complete *ev; struct hci_conn *conn; + ev = hci_le_ev_skb_pull(hdev, skb, HCI_EV_LE_EXT_ADV_REPORT, + sizeof(*ev)); + if (!ev) + return; + BT_DBG("%s status 0x%2.2x", hdev->name, ev->status); hci_dev_lock(hdev); @@ -6677,12 +6714,16 @@ static void hci_le_remote_feat_complete_evt(struct hci_dev *hdev, static void hci_le_ltk_request_evt(struct hci_dev *hdev, struct sk_buff *skb) { - struct hci_ev_le_ltk_req *ev = (void *) skb->data; + struct hci_ev_le_ltk_req *ev; struct hci_cp_le_ltk_reply cp; struct hci_cp_le_ltk_neg_reply neg; struct hci_conn *conn; struct smp_ltk *ltk; + ev = hci_le_ev_skb_pull(hdev, skb, HCI_EV_LE_LTK_REQ, sizeof(*ev)); + if (!ev) + return; + BT_DBG("%s handle 0x%4.4x", hdev->name, __le16_to_cpu(ev->handle)); hci_dev_lock(hdev); @@ -6754,11 +6795,16 @@ static void send_conn_param_neg_reply(struct hci_dev *hdev, u16 handle, static void hci_le_remote_conn_param_req_evt(struct hci_dev *hdev, struct sk_buff *skb) { - struct hci_ev_le_remote_conn_param_req *ev = (void *) skb->data; + struct hci_ev_le_remote_conn_param_req *ev; struct hci_cp_le_conn_param_req_reply cp; struct hci_conn *hcon; u16 handle, min, max, latency, timeout; + ev = hci_le_ev_skb_pull(hdev, skb, HCI_EV_LE_REMOTE_CONN_PARAM_REQ, + sizeof(*ev)); + if (!ev) + return; + handle = le16_to_cpu(ev->handle); min = le16_to_cpu(ev->interval_min); max = le16_to_cpu(ev->interval_max); @@ -6831,9 +6877,14 @@ static void hci_le_direct_adv_report_evt(struct hci_dev *hdev, static void hci_le_phy_update_evt(struct hci_dev *hdev, struct sk_buff *skb) { - struct hci_ev_le_phy_update_complete *ev = (void *) skb->data; + struct hci_ev_le_phy_update_complete *ev; struct hci_conn *conn; + ev = hci_le_ev_skb_pull(hdev, skb, HCI_EV_LE_PHY_UPDATE_COMPLETE, + sizeof(*ev)); + if (ev) + return; + BT_DBG("%s status 0x%2.2x", hdev->name, ev->status); if (ev->status) @@ -6854,11 +6905,13 @@ static void hci_le_phy_update_evt(struct hci_dev *hdev, struct sk_buff *skb) static void hci_le_meta_evt(struct hci_dev *hdev, struct sk_buff *skb) { - struct hci_ev_le_meta *le_ev = (void *) skb->data; + struct hci_ev_le_meta *ev; - skb_pull(skb, sizeof(*le_ev)); + ev = hci_ev_skb_pull(hdev, skb, HCI_EV_LE_META, sizeof(*ev)); + if (!ev) + return; - switch (le_ev->subevent) { + switch (ev->subevent) { case HCI_EV_LE_CONN_COMPLETE: hci_le_conn_complete_evt(hdev, skb); break;