[PATCH v2 2/2] Bluetooth: ISO: Fix UAF on iso_sock_timeout

[Luiz Augusto von Dentz <luiz.dentz@gmail.com>]

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

conn->sk maybe have been unlinked/freed while waiting for iso_conn_lock
so this checks if the conn->sk is still valid by checking if it part of
iso_sk_list.

Fixes: ccf74f2390d6 ("Bluetooth: Add BTPROTO_ISO socket type")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---
 net/bluetooth/iso.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/net/bluetooth/iso.c b/net/bluetooth/iso.c
index c9eefb43bf47..7a83e400ac77 100644
--- a/net/bluetooth/iso.c
+++ b/net/bluetooth/iso.c
@@ -93,6 +93,16 @@ static struct sock *iso_get_sock(bdaddr_t *src, bdaddr_t *dst,
 #define ISO_CONN_TIMEOUT	(HZ * 40)
 #define ISO_DISCONN_TIMEOUT	(HZ * 2)
 
+static struct sock *iso_sock_hold(struct iso_conn *conn)
+{
+	if (!conn || !bt_sock_linked(&iso_sk_list, conn->sk))
+		return NULL;
+
+	sock_hold(conn->sk);
+
+	return conn->sk;
+}
+
 static void iso_sock_timeout(struct work_struct *work)
 {
 	struct iso_conn *conn = container_of(work, struct iso_conn,
@@ -100,9 +110,7 @@ static void iso_sock_timeout(struct work_struct *work)
 	struct sock *sk;
 
 	iso_conn_lock(conn);
-	sk = conn->sk;
-	if (sk)
-		sock_hold(sk);
+	sk = iso_sock_hold(conn);
 	iso_conn_unlock(conn);
 
 	if (!sk)
@@ -209,9 +217,7 @@ static void iso_conn_del(struct hci_conn *hcon, int err)
 
 	/* Kill socket */
 	iso_conn_lock(conn);
-	sk = conn->sk;
-	if (sk)
-		sock_hold(sk);
+	sk = iso_sock_hold(conn);
 	iso_conn_unlock(conn);
 
 	if (sk) {
-- 
2.47.0