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

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Date: Mon, 24 Jun 2024 18:40:01 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <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

On Wed, 19 Jun 2024 04:23:24 -0700
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    2ccbdf43d5e7 Merge tag 'for-linus' of git://git.kernel.org..
> git tree:       upstream
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=125874ea980000

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

--- x/net/bluetooth/hci_request.c
+++ h/net/bluetooth/hci_request.c
@@ -160,6 +160,8 @@ int __hci_req_sync(struct hci_dev *hdev,
 
 	if (err == -ERESTARTSYS)
 		return -EINTR;
+	if (!err)
+		return -ETIMEDOUT;
 
 	switch (hdev->req_status) {
 	case HCI_REQ_DONE:
--