Re: [syzbot] test uaf in hci_conn_drop

[syzbot <syzbot+1683f76f1b20b826de67@syzkaller.appspotmail.com>]

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Subject: test uaf in hci_conn_drop
Author: lizhi.xu@windriver.com

#syz test git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git 8de1e7afcc1c

diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c
index 15b33579007c..757ff04bb5d8 100644
--- a/net/bluetooth/hci_sysfs.c
+++ b/net/bluetooth/hci_sysfs.c
@@ -13,6 +13,8 @@ static const struct class bt_class = {
 static void bt_link_release(struct device *dev)
 {
 	struct hci_conn *conn = to_hci_conn(dev);
+	struct sco_conn *scn = container_of(conn, struct sco_conn, hci_conn);
+	scn->hci_conn = NULL;
 	kfree(conn);
 }