6.11-stable review patch. If anyone has any objections, please let me know.
------------------
From: Iulia Tanasescu <iulia.tanasescu@xxxxxxx>
[ Upstream commit 07a9342b94a91b306ed1cf6aa8254aea210764c9 ]
Before issuing the LE BIG Create Sync command, an available BIG handle
is chosen by iterating through the conn_hash list and finding the first
unused value.
If a BIG is terminated, the associated hcons are removed from the list
and the LE BIG Terminate Sync command is sent via hci_sync queue.
However, a new LE BIG Create sync command might be issued via
hci_send_cmd, before the previous BIG sync was terminated. This
can cause the same BIG handle to be reused and the LE BIG Create Sync
to fail with Command Disallowed.
< HCI Command: LE Broadcast Isochronous Group Create Sync (0x08|0x006b)
BIG Handle: 0x00
BIG Sync Handle: 0x0002
Encryption: Unencrypted (0x00)
Broadcast Code[16]: 00000000000000000000000000000000
Maximum Number Subevents: 0x00
Timeout: 20000 ms (0x07d0)
Number of BIS: 1
BIS ID: 0x01
> HCI Event: Command Status (0x0f) plen 4
LE Broadcast Isochronous Group Create Sync (0x08|0x006b) ncmd 1
Status: Command Disallowed (0x0c)
< HCI Command: LE Broadcast Isochronous Group Terminate Sync (0x08|0x006c)
BIG Handle: 0x00
This commit fixes the ordering of the LE BIG Create Sync/LE BIG Terminate
Sync commands, to make sure that either the previous BIG sync is
terminated before reusing the handle, or that a new handle is chosen
for a new sync.
Fixes: eca0ae4aea66 ("Bluetooth: Add initial implementation of BIS connections")
Signed-off-by: Iulia Tanasescu <iulia.tanasescu@xxxxxxx>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/bluetooth/hci_conn.c | 17 ++++++++++++++++-
net/bluetooth/iso.c | 9 +++++++++
2 files changed, 25 insertions(+), 1 deletion(-)
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index b2bb14055a759..cc3253e9d41d0 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -2189,7 +2189,15 @@ static bool hci_conn_check_create_big_sync(struct hci_conn *conn)
return true;
}
-int hci_le_big_create_sync_pending(struct hci_dev *hdev)
+static void big_create_sync_complete(struct hci_dev *hdev, void *data, int err)
+{
+ bt_dev_dbg(hdev, "");
+
+ if (err)
+ bt_dev_err(hdev, "Unable to create BIG sync: %d", err);
+}
+
+static int big_create_sync(struct hci_dev *hdev, void *data)
{
DEFINE_FLEX(struct hci_cp_le_big_create_sync, pdu, bis, num_bis, 0x11);
struct hci_conn *conn;
@@ -2246,6 +2254,13 @@ int hci_le_big_create_sync_pending(struct hci_dev *hdev)
struct_size(pdu, bis, pdu->num_bis), pdu);
}
+int hci_le_big_create_sync_pending(struct hci_dev *hdev)
+{
+ /* Queue big_create_sync */
+ return hci_cmd_sync_queue_once(hdev, big_create_sync,
+ NULL, big_create_sync_complete);
+}
+
int hci_le_big_create_sync(struct hci_dev *hdev, struct hci_conn *hcon,
struct bt_iso_qos *qos,
__u16 sync_handle, __u8 num_bis, __u8 bis[])
diff --git a/net/bluetooth/iso.c b/net/bluetooth/iso.c
index 463c61712b249..5e2d9758bd3c1 100644
--- a/net/bluetooth/iso.c
+++ b/net/bluetooth/iso.c
@@ -1392,6 +1392,13 @@ static void iso_conn_big_sync(struct sock *sk)
if (!hdev)
return;
+ /* hci_le_big_create_sync requires hdev lock to be held, since
+ * it enqueues the HCI LE BIG Create Sync command via
+ * hci_cmd_sync_queue_once, which checks hdev flags that might
+ * change.
+ */
+ hci_dev_lock(hdev);
+
if (!test_and_set_bit(BT_SK_BIG_SYNC, &iso_pi(sk)->flags)) {
err = hci_le_big_create_sync(hdev, iso_pi(sk)->conn->hcon,
&iso_pi(sk)->qos,
@@ -1402,6 +1409,8 @@ static void iso_conn_big_sync(struct sock *sk)
bt_dev_err(hdev, "hci_le_big_create_sync: %d",
err);
}
+
+ hci_dev_unlock(hdev);
}
static int iso_sock_recvmsg(struct socket *sock, struct msghdr *msg,
--
2.43.0
