From 81d8e9f59df63b8358751c1ffed9f1cf5c796909 Mon Sep 17 00:00:00 2001 From: Manish Mandlik Date: Fri, 4 Aug 2023 11:14:45 -0700 Subject: [PATCH] Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_add_adv_monitor() [ Upstream commit a2bcd2b63271a93a695fabbfbf459c603d956d48 ] KSAN reports use-after-free in hci_add_adv_monitor(). While adding an adv monitor, hci_add_adv_monitor() calls -> msft_add_monitor_pattern() calls -> msft_add_monitor_sync() calls -> msft_le_monitor_advertisement_cb() calls in an error case -> hci_free_adv_monitor() which frees the *moniter. This is referenced by bt_dev_dbg() in hci_add_adv_monitor(). Fix the bt_dev_dbg() by using handle instead of monitor->handle. Fixes: b747a83690c8 ("Bluetooth: hci_sync: Refactor add Adv Monitor") Signed-off-by: Manish Mandlik Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Sasha Levin --- net/bluetooth/hci_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 561e8a77f64cd..146553c0054f6 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -1957,7 +1957,7 @@ int hci_add_adv_monitor(struct hci_dev *hdev, struct adv_monitor *monitor) case HCI_ADV_MONITOR_EXT_MSFT: status = msft_add_monitor_pattern(hdev, monitor); bt_dev_dbg(hdev, "add monitor %d msft status %d", - monitor->handle, status); + handle, status); break; }