commit 338af7f9f00e096b65a6d823f885c4eeaf1d1f8c
Author: Steve Dickson <steved@redhat.com>
Date:   Mon Oct 27 12:46:54 2008 -0400

    __rpc_taddr2uaddr_af() assumes the netbuf to always have a
    non-zero data. This is a bad assumption and can lead to a
    seg-fault. This patch adds a check for zero length and returns
    NULL when found.
    
    Signed-off-by: Steve Dickson <steved@redhat.com>

diff --git a/src/rpc_generic.c b/src/rpc_generic.c
index 3aad018..27de254 100644
--- a/src/rpc_generic.c
+++ b/src/rpc_generic.c
@@ -603,6 +603,9 @@ __rpc_taddr2uaddr_af(int af, const struct netbuf *nbuf)
 #endif
 	u_int16_t port;
 
+	if (nbuf->len <= 0)
+		return NULL;
+
 	switch (af) {
 	case AF_INET:
 		sin = nbuf->buf;