fix a braino in cmsghdr_from_user_compat_to_kern()

commit 547ce4c ("switch cmsghdr_from_user_compat_to_kern() to
copy_from_user()") missed one of the places where ucmlen should've been
replaced with cmsg.cmsg_len, now that we are fetching the entire struct
rather than doing it field-by-field.

	As the result, compat sendmsg() with several different-sized cmsg
attached started to fail with EINVAL.  Trivial to fix, fortunately.

Fixes: 547ce4c ("switch cmsghdr_from_user_compat_to_kern() to copy_from_user()")
Reported-by: Nick Bowler <[email protected]>
Tested-by: Nick Bowler <[email protected]>
Signed-off-by: Al Viro <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Al Viro

net/compat.c

@@ -202,7 +202,7 @@ int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 
 		/* Advance. */
 		kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
-		ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
+		ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, cmsg.cmsg_len);
 	}
 
 	/*