[PATCH 05/15] Bluetooth: HCI: Use skb_pull_data to parse Inquiry Result event
STALE1665d
From: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Date: 2021-12-01 00:03:24
Also in:
linux-bluetooth
Subsystem:
bluetooth subsystem, the rest · Maintainers:
Marcel Holtmann, Luiz Augusto von Dentz, Linus Torvalds
Revision v1 of 2 in this series.
Revisions (2)
- v1 current
- v2 [diff vs current]
From: Luiz Augusto von Dentz <redacted> This uses skb_pull_data to check the Inquiry Result events received have the minimum required length. Signed-off-by: Luiz Augusto von Dentz <redacted> --- include/net/bluetooth/hci.h | 5 +++++ net/bluetooth/hci_event.c | 19 ++++++++++++++----- 2 files changed, 19 insertions(+), 5 deletions(-)
diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 3f57fd677b67..55466bfb972a 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h@@ -2028,6 +2028,11 @@ struct inquiry_info { __le16 clock_offset; } __packed; +struct hci_ev_inquiry_result { + __u8 num; + struct inquiry_info info[]; +}; + #define HCI_EV_CONN_COMPLETE 0x03 struct hci_ev_conn_complete { __u8 status;
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index b27a4ad647ca..0bf062f6f262 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c@@ -3180,13 +3180,21 @@ static void hci_inquiry_complete_evt(struct hci_dev *hdev, struct sk_buff *skb) static void hci_inquiry_result_evt(struct hci_dev *hdev, struct sk_buff *skb) { + struct hci_ev_inquiry_result *ev; struct inquiry_data data; - struct inquiry_info *info = (void *) (skb->data + 1); - int num_rsp = *((__u8 *) skb->data); + int i; - BT_DBG("%s num_rsp %d", hdev->name, num_rsp); + ev = hci_ev_skb_pull(hdev, skb, HCI_EV_INQUIRY_RESULT, sizeof(*ev)); + if (!ev) + return; - if (!num_rsp || skb->len < num_rsp * sizeof(*info) + 1) + if (!hci_ev_skb_pull(hdev, skb, HCI_EV_INQUIRY_RESULT, + flex_array_size(ev, info, ev->num))) + return; + + BT_DBG("%s num %d", hdev->name, ev->num); + + if (!ev->num) return; if (hci_dev_test_flag(hdev, HCI_PERIODIC_INQ))
@@ -3194,7 +3202,8 @@ static void hci_inquiry_result_evt(struct hci_dev *hdev, struct sk_buff *skb) hci_dev_lock(hdev); - for (; num_rsp; num_rsp--, info++) { + for (i = 0; i < ev->num; i++) { + struct inquiry_info *info = &ev->info[i]; u32 flags; bacpy(&data.bdaddr, &info->bdaddr);
--
2.33.1