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Bluetooth: ISO: clear iso_data always when detaching conn from hcon

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When setting conn->hcon = NULL, also conn->hcon->iso_data = NULL is
necessary, otherwise later iso_conn_free() will UAF.

Fix clearing of iso_data in iso_sock_disconn()

Fixes KASAN: slab-use-after-free in iso_conn_hold_unless_zero on
iso_sock_release() followed by hci_abort_conn_sync().

Fixes: fbdc4bc472 ("Bluetooth: ISO: Use defer setup to separate PA sync and BIG sync")
Signed-off-by: Pauli Virtanen <[email protected]>
Signed-off-by: Luiz Augusto von Dentz <[email protected]>
This commit is contained in:
Pauli Virtanen authored and Luiz Augusto von Dentz committed 2026-07-28 14:45:34 -04:00
1 parent e095f249e2
commit d57e506f6a
1 file changed
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net/bluetooth/iso.c
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@@ -837,6 +837,7 @@ static void iso_sock_disconn(struct sock *sk)
sk->sk_state = BT_DISCONN;
iso_conn_lock(iso_pi(sk)->conn);
hci_conn_drop(iso_pi(sk)->conn->hcon);
iso_pi(sk)->conn->hcon->iso_data = NULL;
iso_pi(sk)->conn->hcon = NULL;
iso_conn_unlock(iso_pi(sk)->conn);
}