[PATCH 6.6 146/322] Bluetooth: ISO: Avoid creating child socket if PA sync is terminating

Greg Kroah-Hartman
2024-02-03T04:13:04Z

From: Iulia Tanasescu <iulia.tanasescu@nxp.com>

[ Upstream commit 9f150019f176078144b02c4b9b9dbe7fd5a2fcc3 ]

When a PA sync socket is closed, the associated hcon is also unlinked
and cleaned up. If there are no other hcons marked with the
HCI_CONN_PA_SYNC flag, HCI_OP_LE_PA_TERM_SYNC is sent to controller.

Between the time of the command and the moment PA sync is terminated
in controller, residual BIGInfo reports might continue to come.
This causes a new PA sync hcon to be added, and a new socket to be
notified to user space.

This commit fixs this by adding a flag on a Broadcast listening
socket to mark when the PA sync child has been closed.

This flag is checked when BIGInfo reports are indicated in
iso_connect_ind, to avoid recreating a hcon and socket if
residual reports arrive before PA sync is terminated.

Signed-off-by: Iulia Tanasescu <iulia.tanasescu@nxp.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/bluetooth/iso.c | 51 ++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 48 insertions(+), 3 deletions(-)

diff --git a/net/bluetooth/iso.c b/net/bluetooth/iso.c
index 2132a16be93c..0eeec6480139 100644
--- a/net/bluetooth/iso.c
+++ b/net/bluetooth/iso.c
@@ -52,6 +52,7 @@ static void iso_sock_kill(struct sock *sk);
enum {
BT_SK_BIG_SYNC,
BT_SK_PA_SYNC,
+ BT_SK_PA_SYNC_TERM,
};

struct iso_pinfo {
@@ -80,6 +81,11 @@ static bool iso_match_sid(struct sock *sk, void *data);
static bool iso_match_sync_handle(struct sock *sk, void *data);
static void iso_sock_disconn(struct sock *sk);

+typedef bool (*iso_sock_match_t)(struct sock *sk, void *data);
+
+static struct sock *iso_get_sock_listen(bdaddr_t *src, bdaddr_t *dst,
+ iso_sock_match_t match, void *data);
+
/* ---- ISO timers ---- */
#define ISO_CONN_TIMEOUT (HZ * 40)
#define ISO_DISCONN_TIMEOUT (HZ * 2)
@@ -188,10 +194,21 @@ static void iso_chan_del(struct sock *sk, int err)
sock_set_flag(sk, SOCK_ZAPPED);
}

+static bool iso_match_conn_sync_handle(struct sock *sk, void *data)
+{
+ struct hci_conn *hcon = data;
+
+ if (test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags))
+ return false;
+
+ return hcon->sync_handle == iso_pi(sk)->sync_handle;
+}
+
static void iso_conn_del(struct hci_conn *hcon, int err)
{
struct iso_conn *conn = hcon->iso_data;
struct sock *sk;
+ struct sock *parent;

if (!conn)
return;
@@ -207,6 +224,25 @@ static void iso_conn_del(struct hci_conn *hcon, int err)

if (sk) {
lock_sock(sk);
+
+ /* While a PA sync hcon is in the process of closing,
+ * mark parent socket with a flag, so that any residual
+ * BIGInfo adv reports that arrive before PA sync is
+ * terminated are not processed anymore.
+ */
+ if (test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags)) {
+ parent = iso_get_sock_listen(&hcon->src,
+ &hcon->dst,
+ iso_match_conn_sync_handle,
+ hcon);
+
+ if (parent) {
+ set_bit(BT_SK_PA_SYNC_TERM,
+ &iso_pi(parent)->flags);
+ sock_put(parent);
+ }
+ }
+
iso_sock_clear_timer(sk);
iso_chan_del(sk, err);
release_sock(sk);
@@ -543,8 +579,6 @@ static struct sock *__iso_get_sock_listen_by_sid(bdaddr_t *ba, bdaddr_t *bc,
return NULL;
}

-typedef bool (*iso_sock_match_t)(struct sock *sk, void *data);
-
/* Find socket listening:
* source bdaddr (Unicast)
* destination bdaddr (Broadcast only)
@@ -1756,9 +1790,20 @@ int iso_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
/* Try to get PA sync listening socket, if it exists */
sk = iso_get_sock_listen(&hdev->bdaddr, bdaddr,
iso_match_pa_sync_flag, NULL);
- if (!sk)
+
+ if (!sk) {
sk = iso_get_sock_listen(&hdev->bdaddr, bdaddr,
iso_match_sync_handle, ev2);
+
+ /* If PA Sync is in process of terminating,
+ * do not handle any more BIGInfo adv reports.
+ */
+
+ if (sk && test_bit(BT_SK_PA_SYNC_TERM,
+ &iso_pi(sk)->flags))
+ return lm;
+ }
+
if (sk) {
int err;

--
2.43.0