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

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Message-ID: <tencent_C4F16D10941CEB5AED86CD707A4E6F502F0A@qq.com>
Date: Sun, 23 Jun 2024 11:42:30 +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 efea25eb56ce..c98d573eae87 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -106,7 +106,13 @@ void hci_req_sync_complete(struct hci_dev *hdev, u8 result, u16 opcode,
 		hdev->req_result = result;
 		hdev->req_status = HCI_REQ_DONE;
 		if (skb) {
-			kfree_skb(hdev->req_skb);
+			if (!hdev->req_skb)
+				printk("skb: %p, fclone: %d %s\n", skb, skb->fclone, __func__);
+
+			if (hdev->req_skb && hdev->req_skb->fclone == SKB_FCLONE_CLONE) {
+				printk("skb: %p, skb fc: %d, rskb: %p, rskb fc: %d, %s\n", skb, skb->fclone, hdev->req_skb, hdev->req_skb->fclone, __func__);
+				kfree_skb(hdev->req_skb);
+			}
 			hdev->req_skb = skb_get(skb);
 		}
 		wake_up_interruptible(&hdev->req_wait_q);