[PATCH] Bluetooth: fix oob in hci_sock_setsockopt

[Edward Adam Davis]

If len < sizeof(opt) it will trigger oob, so take the min of them.

Reported-by: syzbot+837ba09d9db969068367@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Edward Adam Davis <eadavis@xxxxxx>
---
 net/bluetooth/hci_sock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index 4ee1b976678b..cee7ec1adbd2 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -1946,7 +1946,7 @@ static int hci_sock_setsockopt_old(struct socket *sock, int level, int optname,
 
 	switch (optname) {
 	case HCI_DATA_DIR:
-		if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
+		if (copy_from_sockptr(&opt, optval, min_t(int, sizeof(opt), len))) {
 			err = -EFAULT;
 			break;
 		}
-- 
2.43.0