do_ipv6_setsockopt(): don't open-code memdup_user()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index a531ba032b85da42d3b5eefcbd9e2e624b5a2868..f8298c9a3160f9eab6f260e7d8b8ddcce4af5fea 100644 (file)
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -735,14 +735,9 @@ done:
                        retv = -ENOBUFS;
                        break;
                }
-               gsf = kmalloc(optlen, GFP_KERNEL);
-               if (!gsf) {
-                       retv = -ENOBUFS;
-                       break;
-               }
-               retv = -EFAULT;
-               if (copy_from_user(gsf, optval, optlen)) {
-                       kfree(gsf);
+               gsf = memdup_user(optval, optlen);
+               if (IS_ERR(gsf)) {
+                       retv = PTR_ERR(gsf);
                        break;
                }
                /* numsrc >= (4G-140)/128 overflow in 32 bits */