rds: Fix rds message leak in rds_message_map_pages

The sgs allocation error path leaks the allocated message.
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Acked-by: NAndy Grover <andy.grover@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/rds/message.c

@@ -249,8 +249,10 @@ struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned in
 	rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
 	rm->data.op_nents = ceil(total_len, PAGE_SIZE);
 	rm->data.op_sg = rds_message_alloc_sgs(rm, num_sgs);
-	if (!rm->data.op_sg)
+	if (!rm->data.op_sg) {
+		rds_message_put(rm);
 		return ERR_PTR(-ENOMEM);
+	}
 
 	for (i = 0; i < rm->data.op_nents; ++i) {
 		sg_set_page(&rm->data.op_sg[i],