linux-kernel - [PATCH v2 2/8] Bluetooth: hci_conn: take hdev lock in set_cig_params

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Message-ID: <e3b024f672732a8b244022f7c9ac23826a130d2a.1762100290.git.pav@iki.fi>
Date: Sun,  2 Nov 2025 18:19:34 +0200
From: Pauli Virtanen <pav@....fi>
To: linux-bluetooth@...r.kernel.org
Cc: Pauli Virtanen <pav@....fi>,
	marcel@...tmann.org,
	johan.hedberg@...il.com,
	luiz.dentz@...il.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/8] Bluetooth: hci_conn: take hdev lock in set_cig_params_sync

Take hdev lock to prevent hci_conn from being deleted or modified
concurrently.

Fixes: a091289218202 ("Bluetooth: hci_conn: Fix hci_le_set_cig_params")
Signed-off-by: Pauli Virtanen <pav@....fi>
---

Notes:
    v2:
    - no change

 net/bluetooth/hci_conn.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index d6162a95048e..d140e5740f92 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -1825,9 +1825,13 @@ static int set_cig_params_sync(struct hci_dev *hdev, void *data)
 	u8 aux_num_cis = 0;
 	u8 cis_id;
 
+	hci_dev_lock(hdev);
+
 	conn = hci_conn_hash_lookup_cig(hdev, cig_id);
-	if (!conn)
+	if (!conn) {
+		hci_dev_unlock(hdev);
 		return 0;
+	}
 
 	qos = &conn->iso_qos;
 	pdu->cig_id = cig_id;
@@ -1866,6 +1870,8 @@ static int set_cig_params_sync(struct hci_dev *hdev, void *data)
 	}
 	pdu->num_cis = aux_num_cis;
 
+	hci_dev_unlock(hdev);
+
 	if (!pdu->num_cis)
 		return 0;
 
-- 
2.51.1