af_iucv: convert to getsockopt_iter

Convert IUCV 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()

Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Acked-by: Alexandra Winter <wintera@linux.ibm.com>
Signed-off-by: Breno Leitao <leitao@debian.org>
Link: https://patch.msgid.link/20260520-getsock_four-v3-1-b8c0b16b7780@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index 72dfccd4e3d58813e00ebfe38cdff492e2977197..7a5ce93a83d9c65b7701d16a50e8f249de5d9f52 100644 (file)
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -26,6 +26,7 @@
 #include <linux/init.h>
 #include <linux/poll.h>
 #include <linux/security.h>
+#include <linux/uio.h>
 #include <net/sock.h>
 #include <asm/machine.h>
 #include <asm/ebcdic.h>
@@ -1535,7 +1536,7 @@ static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
 }
 
 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
-                               char __user *optval, int __user *optlen)
+                               sockopt_t *opt)
 {
        struct sock *sk = sock->sk;
        struct iucv_sock *iucv = iucv_sk(sk);
@@ -1545,9 +1546,7 @@ static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
        if (level != SOL_IUCV)
                return -ENOPROTOOPT;
 
-       if (get_user(len, optlen))
-               return -EFAULT;
-
+       len = opt->optlen;
        if (len < 0)
                return -EINVAL;
 
@@ -1574,9 +1573,8 @@ static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
                return -ENOPROTOOPT;
        }
 
-       if (put_user(len, optlen))
-               return -EFAULT;
-       if (copy_to_user(optval, &val, len))
+       opt->optlen = len;
+       if (copy_to_iter(&val, len, &opt->iter_out) != len)
                return -EFAULT;
 
        return 0;
@@ -2228,7 +2226,7 @@ static const struct proto_ops iucv_sock_ops = {
        .socketpair     = sock_no_socketpair,
        .shutdown       = iucv_sock_shutdown,
        .setsockopt     = iucv_sock_setsockopt,
-       .getsockopt     = iucv_sock_getsockopt,
+       .getsockopt_iter = iucv_sock_getsockopt,
 };
 
 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,