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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Dan Carpenter <dan.carpenter@oracle.com>,
        Marcel Holtmann <marcel@holtmann.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.16 0417/1039] Bluetooth: hci_sock: fix endian bug in hci_sock_setsockopt()
Date:   Mon, 24 Jan 2022 19:36:46 +0100
Message-Id: <20220124184139.328443652@linuxfoundation.org>
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From: Dan Carpenter <dan.carpenter@oracle.com>

[ Upstream commit b9f9dbad0bd1c302d357fdd327c398f51f5fc2b1 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/bluetooth/hci_sock.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index d0dad1fafe079..f2506e656f3e4 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -1915,7 +1915,8 @@ 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);
 
@@ -1941,7 +1942,7 @@ 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;
 		}
-- 
2.34.1