linux-kernel - Re: [syzbot] [bluetooth?] KASAN: invalid-free in hci_req_sync

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Message-ID: <tencent_86BE4A6A74B1761566A83D5B36EC969C3609@qq.com>
Date: Mon, 24 Jun 2024 20:07:26 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+35ebc808442df6420eae@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bluetooth?] KASAN: invalid-free in hci_req_sync_complete

please test db free in hci_req_sync_complete

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2ccbdf43d5e7

diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
index 3862fa6bb288..4d5807fff946 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -121,6 +121,7 @@ int __hci_req_sync(struct hci_dev *hdev, int (*func)(struct hci_request *req,
 {
 	struct hci_request req;
 	int err = 0;
+	struct sk_buff	*req_skb;
 
 	bt_dev_dbg(hdev, "start");
 
@@ -182,8 +183,9 @@ int __hci_req_sync(struct hci_dev *hdev, int (*func)(struct hci_request *req,
 		break;
 	}
 
-	kfree_skb(hdev->req_skb);
+	req_skb = hdev->req_skb;
 	hdev->req_skb = NULL;
+	kfree_skb(req_skb);
 	hdev->req_status = hdev->req_result = 0;
 
 	bt_dev_dbg(hdev, "end: err %d", err);