linux-kernel - Re: [syzbot] [bluetooth?] [usb?] memory leak in __hci_cmd_sync

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Message-ID: <tencent_629297F0369E4A8C75C17711675A3CC53709@qq.com>
Date: Thu, 20 Nov 2025 21:27:36 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+f098d64cc684b8dbaf65@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bluetooth?] [usb?] memory leak in __hci_cmd_sync_sk

#syz test

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 3418d7b964a1..62469dba9e63 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -1466,7 +1466,7 @@ static void hci_cmd_timeout(struct work_struct *work)
 	if (hdev->req_skb) {
 		u16 opcode = hci_skb_opcode(hdev->req_skb);
 
-		bt_dev_err(hdev, "command 0x%4.4x tx timeout", opcode);
+		bt_dev_err(hdev, "command 0x%4.4x skb: %p tx timeout", opcode, hdev->req_skb);
 
 		hci_cmd_sync_cancel_sync(hdev, ETIMEDOUT);
 	} else {
diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index 6e76798ec786..881da7b16257 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -133,6 +133,8 @@ static int hci_req_sync_run(struct hci_request *req)
 		return -ENODATA;
 
 	skb = skb_peek_tail(&req->cmd_q);
+	printk("status: %u, result: %u, skb: %p, %s\n",
+		hdev->req_status, hdev->req_result, hdev->req_rsp, __func__);
 	bt_cb(skb)->hci.req_complete_skb = hci_cmd_sync_complete;
 	bt_cb(skb)->hci.req_flags |= HCI_REQ_SKB;
 
@@ -203,6 +205,9 @@ struct sk_buff *__hci_cmd_sync_sk(struct hci_dev *hdev, u16 opcode, u32 plen,
 
 	if (err < 0) {
 		kfree_skb(skb);
+		flush_work(&hdev->cmd_work);
+		skb_queue_purge(&hdev->cmd_q);
+
 		return ERR_PTR(err);
 	}