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 a531ba0..f8298c9 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -735,14 +735,9 @@
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 */