From 966c731e73a4b45c1cf5eb22f83364f9824664ff Mon Sep 17 00:00:00 2001
From: Victor Julien <victor@inliniac.net>
Date: Fri, 2 Nov 2012 09:18:15 +0100
Subject: [PATCH] flow: fix crash when flow engine under extreme stress, and
 unable to force free any existing flow

---
 src/flow-hash.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/flow-hash.c b/src/flow-hash.c
index 283cbc480c..f64aacd10b 100644
--- a/src/flow-hash.c
+++ b/src/flow-hash.c
@@ -425,6 +425,10 @@ static Flow *FlowGetNew(Packet *p) {
             }
 
             f = FlowGetUsedFlow();
+            if (f == NULL) {
+                /* very rare, but we can fail. Just giving up */
+                return NULL;
+            }
 
             /* freed a flow, but it's unlocked */
         } else {