From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Fri, 7 Jan 2022 07:17:27 +0000 (+0300)
Subject: Bluetooth: hci_sock: fix endian bug in hci_sock_setsockopt()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=b9f9dbad0bd1c302d357fdd327c398f51f5fc2b1;p=linux.git

Bluetooth: hci_sock: fix endian bug in hci_sock_setsockopt()

This copies a u16 into the high bits of an int, which works on a big
endian system but not on a little endian system.

Fixes: 09572fca7223 ("Bluetooth: hci_sock: Add support for BT_{SND,RCV}BUF")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
---

diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index 446573a125711..33b3c0ffc3399 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -1911,7 +1911,8 @@ static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
 			       sockptr_t optval, unsigned int len)
 {
 	struct sock *sk = sock->sk;
-	int err = 0, opt = 0;
+	int err = 0;
+	u16 opt;
 
 	BT_DBG("sk %p, opt %d", sk, optname);
 
@@ -1937,7 +1938,7 @@ static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
 			goto done;
 		}
 
-		if (copy_from_sockptr(&opt, optval, sizeof(u16))) {
+		if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
 			err = -EFAULT;
 			break;
 		}