From 1d87ef5cb22d4d1709af6b4d0460b0c3e2af9a22 Mon Sep 17 00:00:00 2001
From: Ben Pfaff <blp@nicira.com>
Date: Tue, 23 Nov 2010 13:10:30 -0800
Subject: [PATCH] ofp-print: Fix handling of zero-length actions.

Without this change, zero-length ofp_actions cause an infinite loop.
---
 lib/ofp-print.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/ofp-print.c b/lib/ofp-print.c
index e3cae783..97fd0653 100644
--- a/lib/ofp-print.c
+++ b/lib/ofp-print.c
@@ -314,6 +314,11 @@ ofp_print_action(struct ds *string, const struct ofp_action_header *ah,
         return -1;
     }
 
+    if (!len) {
+        ds_put_format(string, "***zero-length action***\n");
+        return 8;
+    }
+
     if ((len % OFP_ACTION_ALIGN) != 0) {
         ds_put_format(string,
                       "***action %"PRIu16" length not a multiple of %d***\n",
-- 
2.30.2