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bluetooth/hci: disallow setting handle bigger than HCI_CONN_HANDLE_MAX

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[ Upstream commit 1cc18c2ab2e8c54c355ea7c0423a636e415a0c23 ]

Syzbot hit warning in hci_conn_del() caused by freeing handle that was
not allocated using ida allocator.

This is caused by handle bigger than HCI_CONN_HANDLE_MAX passed by
hci_le_big_sync_established_evt(), which makes code think it's unset
connection.

Add same check for handle upper bound as in hci_conn_set_handle() to
prevent warning.

Link: https://syzkaller.appspot.com/bug?extid=b2545b087a01a7319474
Reported-by: syzbot+b2545b087a01a7319474@syzkaller.appspotmail.com
Fixes: 181a42edddf5 ("Bluetooth: Make handle of hci_conn be unique")
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pavel Skripkin 2024-06-20 22:27:47 +03:00 committed by Greg Kroah-Hartman
parent 0456697104
commit 4970e48f83
1 changed files with 12 additions and 3 deletions
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15
net/bluetooth/hci_conn.c
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@ -935,8 +935,8 @@ static int hci_conn_hash_alloc_unset(struct hci_dev *hdev)
U16_MAX, GFP_ATOMIC);
}
struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
u8 role, u16 handle)
static struct hci_conn *__hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
u8 role, u16 handle)
{
struct hci_conn *conn;
@ -1077,7 +1077,16 @@ struct hci_conn *hci_conn_add_unset(struct hci_dev *hdev, int type,
if (unlikely(handle < 0))
return ERR_PTR(-ECONNREFUSED);
return hci_conn_add(hdev, type, dst, role, handle);
return __hci_conn_add(hdev, type, dst, role, handle);
}
struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
u8 role, u16 handle)
{
if (handle > HCI_CONN_HANDLE_MAX)
return ERR_PTR(-EINVAL);
return __hci_conn_add(hdev, type, dst, role, handle);
}
static void hci_conn_cleanup_child(struct hci_conn *conn, u8 reason)