diff options
| author | Radoslaw Biernacki <rad@semihalf.com> | 2022-02-01 20:10:32 +0000 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2022-03-04 16:10:49 +0100 |
| commit | ba17bb62ce415950753c19d16bb43b2bd3701158 (patch) | |
| tree | c0a044ebf28c3a2ad141c6db786f75a77e4c8ad1 /net | |
| parent | a6fbb2bf51adc117e7d4030e4fd55f0763ab890d (diff) | |
Bluetooth: Fix skb allocation in mgmt_remote_name() & mgmt_device_connected()
This patch fixes skb allocation, as lack of space for ev might push skb
tail beyond its end.
Also introduce eir_precalc_len() that can be used instead of magic
numbers for similar eir operations on skb.
Fixes: cf1bce1de7eeb ("Bluetooth: mgmt: Make use of mgmt_send_event_skb in MGMT_EV_DEVICE_FOUND")
Fixes: e96741437ef0a ("Bluetooth: mgmt: Make use of mgmt_send_event_skb in MGMT_EV_DEVICE_CONNECTED")
Signed-off-by: Angela Czubak <acz@semihalf.com>
Signed-off-by: Marek Maslanka <mm@semihalf.com>
Signed-off-by: Radoslaw Biernacki <rad@semihalf.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/bluetooth/eir.h | 5 | ||||
| -rw-r--r-- | net/bluetooth/mgmt.c | 18 |
2 files changed, 13 insertions, 10 deletions
diff --git a/net/bluetooth/eir.h b/net/bluetooth/eir.h index 05e2e917fc25..e5876751f07e 100644 --- a/net/bluetooth/eir.h +++ b/net/bluetooth/eir.h @@ -15,6 +15,11 @@ u8 eir_create_scan_rsp(struct hci_dev *hdev, u8 instance, u8 *ptr); u8 eir_append_local_name(struct hci_dev *hdev, u8 *eir, u8 ad_len); u8 eir_append_appearance(struct hci_dev *hdev, u8 *ptr, u8 ad_len); +static inline u16 eir_precalc_len(u8 data_len) +{ + return sizeof(u8) * 2 + data_len; +} + static inline u16 eir_append_data(u8 *eir, u16 eir_len, u8 type, u8 *data, u8 data_len) { diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c index e0d36d1e4eed..bfacf2ea692f 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -9085,12 +9085,14 @@ void mgmt_device_connected(struct hci_dev *hdev, struct hci_conn *conn, u16 eir_len = 0; u32 flags = 0; + /* allocate buff for LE or BR/EDR adv */ if (conn->le_adv_data_len > 0) skb = mgmt_alloc_skb(hdev, MGMT_EV_DEVICE_CONNECTED, - conn->le_adv_data_len); + sizeof(*ev) + conn->le_adv_data_len); else skb = mgmt_alloc_skb(hdev, MGMT_EV_DEVICE_CONNECTED, - 2 + name_len + 5); + sizeof(*ev) + (name ? eir_precalc_len(name_len) : 0) + + eir_precalc_len(sizeof(conn->dev_class))); ev = skb_put(skb, sizeof(*ev)); bacpy(&ev->addr.bdaddr, &conn->dst); @@ -9809,13 +9811,11 @@ void mgmt_remote_name(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type, { struct sk_buff *skb; struct mgmt_ev_device_found *ev; - u16 eir_len; - u32 flags; + u16 eir_len = 0; + u32 flags = 0; - if (name_len) - skb = mgmt_alloc_skb(hdev, MGMT_EV_DEVICE_FOUND, 2 + name_len); - else - skb = mgmt_alloc_skb(hdev, MGMT_EV_DEVICE_FOUND, 0); + skb = mgmt_alloc_skb(hdev, MGMT_EV_DEVICE_FOUND, + sizeof(*ev) + (name ? eir_precalc_len(name_len) : 0)); ev = skb_put(skb, sizeof(*ev)); bacpy(&ev->addr.bdaddr, bdaddr); @@ -9825,10 +9825,8 @@ void mgmt_remote_name(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type, if (name) { eir_len = eir_append_data(ev->eir, 0, EIR_NAME_COMPLETE, name, name_len); - flags = 0; skb_put(skb, eir_len); } else { - eir_len = 0; flags = MGMT_DEV_FOUND_NAME_REQUEST_FAILED; } |