[PATCH] Bluetooth: purge error queues in socket destructors

[Heitor Alves de Siqueira <halves@igalia.com>]

When TX timestamping is enabled via SO_TIMESTAMPING, SKBs may be queued
into sk_error_queue and will stay there until consumed. If userspace never
gets to read the timestamps, or if the controller is removed unexpectedly,
these SKBs will leak.

Fix by adding skb_queue_purge() calls for sk_error_queue in affected
bluetooth destructors. RFCOMM does not currently use sk_error_queue.

Fixes: 134f4b39df7b ("Bluetooth: add support for skb TX SND/COMPLETION timestamping")
Reported-by: syzbot+7ff4013eabad1407b70a@syzkaller.appspotmail.com
Closes: https://syzbot.org/bug?extid=7ff4013eabad1407b70a
Cc: stable@vger.kernel.org
Signed-off-by: Heitor Alves de Siqueira <halves@igalia.com>
---
 net/bluetooth/hci_sock.c   | 1 +
 net/bluetooth/iso.c        | 1 +
 net/bluetooth/l2cap_sock.c | 1 +
 net/bluetooth/sco.c        | 1 +
 4 files changed, 4 insertions(+)

diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index 4e7bf63af9c5..0290dea081f6 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -2166,6 +2166,7 @@ static void hci_sock_destruct(struct sock *sk)
 	mgmt_cleanup(sk);
 	skb_queue_purge(&sk->sk_receive_queue);
 	skb_queue_purge(&sk->sk_write_queue);
+	skb_queue_purge(&sk->sk_error_queue);
 }
 
 static const struct proto_ops hci_sock_ops = {
diff --git a/net/bluetooth/iso.c b/net/bluetooth/iso.c
index e36d24a9098b..0f07f05c1557 100644
--- a/net/bluetooth/iso.c
+++ b/net/bluetooth/iso.c
@@ -746,6 +746,7 @@ static void iso_sock_destruct(struct sock *sk)
 
 	skb_queue_purge(&sk->sk_receive_queue);
 	skb_queue_purge(&sk->sk_write_queue);
+	skb_queue_purge(&sk->sk_error_queue);
 }
 
 static void iso_sock_cleanup_listen(struct sock *parent)
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index 9ee189c815d4..39d12482fa0b 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -1799,6 +1799,7 @@ static void l2cap_sock_destruct(struct sock *sk)
 
 	skb_queue_purge(&sk->sk_receive_queue);
 	skb_queue_purge(&sk->sk_write_queue);
+	skb_queue_purge(&sk->sk_error_queue);
 }
 
 static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index 87ba90336e80..cccfaf560317 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -470,6 +470,7 @@ static void sco_sock_destruct(struct sock *sk)
 
 	skb_queue_purge(&sk->sk_receive_queue);
 	skb_queue_purge(&sk->sk_write_queue);
+	skb_queue_purge(&sk->sk_error_queue);
 }
 
 static void sco_sock_cleanup_listen(struct sock *parent)

---
base-commit: 192c0159402e6bfbe13de6f8379546943297783d
change-id: 20260211-bt-purge-error-queue-bcccebe5cc25

Best regards,
-- 
Heitor Alves de Siqueira <halves@igalia.com>