From 10346f53f7428442122a0c80dc12019b900737ab Mon Sep 17 00:00:00 2001
From: Alex Coyte <a.coyte@intel.com>
Date: Tue, 3 Jan 2017 12:57:10 +1100
Subject: [PATCH] mcclellan: handle 0 length block scans correctly

---
 src/nfa/mcclellan.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/nfa/mcclellan.c b/src/nfa/mcclellan.c
index 584670c2..6b6848d6 100644
--- a/src/nfa/mcclellan.c
+++ b/src/nfa/mcclellan.c
@@ -375,7 +375,9 @@ char mcclellanExec8_i(const struct mcclellan *m, u32 *state, const u8 *buf,
                       size_t len, u64a offAdj, NfaCallback cb, void *ctxt,
                       char single, const u8 **c_final, enum MatchMode mode) {
     if (!len) {
-        *c_final = buf;
+        if (mode == STOP_AT_MATCH) {
+            *c_final = buf;
+        }
         return MO_ALIVE;
     }
     u32 s = *state;