As pointed out in PR/29138, bpf_write leaks memory in the EMSGSIZE case.
Is it ok to commit the following patch?

Index: bpf.c
===================================================================
RCS file: /cvsroot/src/sys/net/bpf.c,v
retrieving revision 1.107
diff -u -r1.107 bpf.c
--- bpf.c	26 Feb 2005 22:45:09 -0000	1.107
+++ bpf.c	17 Jun 2005 12:26:38 -0000
@@ -589,8 +589,10 @@
 	if (error)
 		return (error);
 
-	if (m->m_pkthdr.len > ifp->if_mtu)
+	if (m->m_pkthdr.len > ifp->if_mtu) {
+		m_freem(m);
 		return (EMSGSIZE);
+	}
 
 	if (d->bd_hdrcmplt)
 		dst.ss_family = pseudo_AF_HDRCMPLT;

-- 
Peter Postma