[PATCH 17/19] atm: switch do_atm_iobuf() to direct use of atm_getnames()

[Al Viro]

From: Al Viro <v...@zeniv.linux.org.uk>

... and sod the compat_alloc_user_space() with its complications

Signed-off-by: Al Viro <v...@zeniv.linux.org.uk>
---
 net/atm/ioctl.c | 25 +++----------------------
 1 file changed, 3 insertions(+), 22 deletions(-)

diff --git a/net/atm/ioctl.c b/net/atm/ioctl.c
index e239cebf48da..fdd0e3434523 100644
--- a/net/atm/ioctl.c
+++ b/net/atm/ioctl.c
@@ -251,32 +251,13 @@ static struct {
 static int do_atm_iobuf(struct socket *sock, unsigned int cmd,
                        unsigned long arg)
 {
-       struct atm_iobuf __user *iobuf;
-       struct compat_atm_iobuf __user *iobuf32;
+       struct compat_atm_iobuf __user *iobuf32 = compat_ptr(arg);
        u32 data;
-       void __user *datap;
-       int len, err;
-
-       iobuf = compat_alloc_user_space(sizeof(*iobuf));
-       iobuf32 = compat_ptr(arg);
 
-       if (get_user(len, &iobuf32->length) ||
-           get_user(data, &iobuf32->buffer))
-               return -EFAULT;
-       datap = compat_ptr(data);
-       if (put_user(len, &iobuf->length) ||
-           put_user(datap, &iobuf->buffer))
+       if (get_user(data, &iobuf32->buffer))
                return -EFAULT;
 
-       err = do_vcc_ioctl(sock, cmd, (unsigned long) iobuf, 0);
-
-       if (!err) {
-               if (copy_in_user(&iobuf32->length, &iobuf->length,
-                                sizeof(int)))
-                       err = -EFAULT;
-       }
-
-       return err;
+       return atm_getnames(&iobuf32->length, compat_ptr(data));
 }
 
 static int do_atmif_sioc(struct socket *sock, unsigned int cmd,
-- 
2.11.0