[PATCH 5.17 0463/1126] Bluetooth: hci_event: Fix HCI_EV_VENDOR max_len

Greg Kroah-Hartman
2022-04-05T08:36:07Z

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

[ Upstream commit 314d8cd2787418c5ac6b02035c344644f47b292b ]

HCI_EV_VENDOR is in fact variable length since it acts as metaevent
where a vendor can implement their own event sets.

In addition to it this makes use of bt_dev_warn_ratelimited to supress
the amount of logging in case the event has more data than expected.

Fixes: 3e54c5890c87 ("Bluetooth: hci_event: Use of a function table to handle HCI event")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/bluetooth/hci_event.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 05997dff5666..a105b7317560 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -6798,7 +6798,7 @@ static const struct hci_ev {
HCI_EV(HCI_EV_NUM_COMP_BLOCKS, hci_num_comp_blocks_evt,
sizeof(struct hci_ev_num_comp_blocks)),
/* [0xff = HCI_EV_VENDOR] */
- HCI_EV(HCI_EV_VENDOR, msft_vendor_evt, 0),
+ HCI_EV_VL(HCI_EV_VENDOR, msft_vendor_evt, 0, HCI_MAX_EVENT_SIZE),
};

static void hci_event_func(struct hci_dev *hdev, u8 event, struct sk_buff *skb,
@@ -6823,8 +6823,9 @@ static void hci_event_func(struct hci_dev *hdev, u8 event, struct sk_buff *skb,
* decide if that is acceptable.
*/
if (skb->len > ev->max_len)
- bt_dev_warn(hdev, "unexpected event 0x%2.2x length: %u > %u",
- event, skb->len, ev->max_len);
+ bt_dev_warn_ratelimited(hdev,
+ "unexpected event 0x%2.2x length: %u > %u",
+ event, skb->len, ev->max_len);

data = hci_ev_skb_pull(hdev, skb, event, ev->min_len);
if (!data)
--
2.34.1