[PATCH net-next v2 3/6] Bluetooth: ISO: convert to getsockopt_iter

[Breno Leitao <leitao@debian.org>]

Convert ISO socket's getsockopt implementation to use the new
getsockopt_iter callback with sockopt_t.

Key changes:
- Replace (char __user *optval, int __user *optlen) with sockopt_t *opt
- Use opt->optlen for buffer length (input) and returned size (output)
- Use copy_to_iter() instead of put_user()/copy_to_user()
- Add linux/uio.h for copy_to_iter()

Signed-off-by: Breno Leitao <leitao@debian.org>
---
 net/bluetooth/iso.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/net/bluetooth/iso.c b/net/bluetooth/iso.c
index 7cb2864fe8724..0d792d36bb5ac 100644
--- a/net/bluetooth/iso.c
+++ b/net/bluetooth/iso.c
@@ -10,6 +10,7 @@
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
 #include <linux/sched/signal.h>
+#include <linux/uio.h>
 
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
@@ -1842,18 +1843,17 @@ static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
 }
 
 static int iso_sock_getsockopt(struct socket *sock, int level, int optname,
-			       char __user *optval, int __user *optlen)
+			       sockopt_t *opt)
 {
 	struct sock *sk = sock->sk;
-	int len, err = 0;
 	struct bt_iso_qos *qos;
+	int len, val, err = 0;
 	u8 base_len;
 	u8 *base;
 
 	BT_DBG("sk %p", sk);
 
-	if (get_user(len, optlen))
-		return -EFAULT;
+	len = opt->optlen;
 
 	lock_sock(sk);
 
@@ -1864,15 +1864,17 @@ static int iso_sock_getsockopt(struct socket *sock, int level, int optname,
 			break;
 		}
 
-		if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
-			     (u32 __user *)optval))
+		val = test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
+		if (copy_to_iter(&val, sizeof(val), &opt->iter_out) !=
+		    sizeof(val))
 			err = -EFAULT;
 
 		break;
 
 	case BT_PKT_STATUS:
-		if (put_user(test_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags),
-			     (int __user *)optval))
+		val = test_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
+		if (copy_to_iter(&val, sizeof(val), &opt->iter_out) !=
+		    sizeof(val))
 			err = -EFAULT;
 		break;
 
@@ -1880,7 +1882,7 @@ static int iso_sock_getsockopt(struct socket *sock, int level, int optname,
 		qos = iso_sock_get_qos(sk);
 
 		len = min_t(unsigned int, len, sizeof(*qos));
-		if (copy_to_user(optval, qos, len))
+		if (copy_to_iter(qos, len, &opt->iter_out) != len)
 			err = -EFAULT;
 
 		break;
@@ -1896,9 +1898,8 @@ static int iso_sock_getsockopt(struct socket *sock, int level, int optname,
 		}
 
 		len = min_t(unsigned int, len, base_len);
-		if (copy_to_user(optval, base, len))
-			err = -EFAULT;
-		if (put_user(len, optlen))
+		opt->optlen = len;
+		if (copy_to_iter(base, len, &opt->iter_out) != len)
 			err = -EFAULT;
 
 		break;
@@ -2660,7 +2661,7 @@ static const struct proto_ops iso_sock_ops = {
 	.socketpair	= sock_no_socketpair,
 	.shutdown	= iso_sock_shutdown,
 	.setsockopt	= iso_sock_setsockopt,
-	.getsockopt	= iso_sock_getsockopt
+	.getsockopt_iter = iso_sock_getsockopt
 };
 
 static const struct net_proto_family iso_sock_family_ops = {

-- 
2.53.0-Meta