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Message-ID: <fcdde042-6424-46a8-9fa6-e4f4021b0717@gmail.com>
Date: Sun, 16 Jun 2024 13:37:17 +0300
From: Pavel Skripkin <paskripkin@...il.com>
To: Edward Adam Davis <eadavis@...com>,
syzbot+b2545b087a01a7319474@...kaller.appspotmail.com
Cc: davem@...emloft.net, edumazet@...gle.com, johan.hedberg@...il.com,
kuba@...nel.org, linux-bluetooth@...r.kernel.org,
linux-kernel@...r.kernel.org, luiz.dentz@...il.com,
luiz.von.dentz@...el.com, marcel@...tmann.org, netdev@...r.kernel.org,
pabeni@...hat.com, syzkaller-bugs@...glegroups.com,
william.xuanziyang@...wei.com
Subject: Re: [PATCH] bluetooth: handle value within the ida range should not
be handled in BIG
On 6/16/24 1:20 PM, 'Edward Adam Davis' via syzkaller-bugs wrote:
> hci_le_big_sync_established_evt is necessary to filter out cases where the handle
> value is belone to ida id range, otherwise ida will be erroneously released in
> hci_conn_cleanup.
>
> Fixes: 181a42edddf5 ("Bluetooth: Make handle of hci_conn be unique")
> Reported-by: syzbot+b2545b087a01a7319474@...kaller.appspotmail.com
> Signed-off-by: Edward Adam Davis <eadavis@...com>
> ---
There is one more user of `hci_conn_add` which may pass too big handle
which is `hci_le_cis_req_evt`.
I think, it should be resolved on API level as I tried to test here [0],
but syzbot is feeling bad for some reason
[0]
https://lore.kernel.org/all/31ac448d-2a21-4e93-8a00-5c7090970452@gmail.com/
> net/bluetooth/hci_event.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> index a487f9df8145..4130d64d9a80 100644
> --- a/net/bluetooth/hci_event.c
> +++ b/net/bluetooth/hci_event.c
> @@ -6893,6 +6893,9 @@ static void hci_le_big_sync_established_evt(struct hci_dev *hdev, void *data,
>
> bis = hci_conn_hash_lookup_handle(hdev, handle);
> if (!bis) {
> + if (handle > HCI_CONN_HANDLE_MAX)
> + continue;
> +
> bis = hci_conn_add(hdev, ISO_LINK, BDADDR_ANY,
> HCI_ROLE_SLAVE, handle);
> if (IS_ERR(bis))
--
With regards,
Pavel Skripkin
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