From 371113e21e808b74cfbb0878ed14e08a3b926d5c Mon Sep 17 00:00:00 2001
From: Victor Julien <victor@inliniac.net>
Date: Tue, 31 May 2016 16:58:29 +0200
Subject: [PATCH] ac-ks: don't allow use on big-endian

---
 src/detect-engine-mpm.c |  7 +++++++
 src/util-mpm-ac-tile.c  | 10 ++++++++++
 2 files changed, 17 insertions(+)

diff --git a/src/detect-engine-mpm.c b/src/detect-engine-mpm.c
index fe469b4a08..dafa2b3a8b 100644
--- a/src/detect-engine-mpm.c
+++ b/src/detect-engine-mpm.c
@@ -335,6 +335,13 @@ uint16_t PatternMatchDefaultMatcher(void)
         uint16_t u;
 
         if (mpm_algo != NULL) {
+#if __BYTE_ORDER == __BIG_ENDIAN
+            if (strcmp(mpm_algo, "ac-ks") == 0) {
+                SCLogError(SC_ERR_INVALID_YAML_CONF_ENTRY, "ac-ks does "
+                        "not work on big endian systems at this time.");
+                exit(EXIT_FAILURE);
+            }
+#endif
             if (strcmp("auto", mpm_algo) == 0) {
                 goto done;
             }
diff --git a/src/util-mpm-ac-tile.c b/src/util-mpm-ac-tile.c
index 425d223766..62fda87e10 100644
--- a/src/util-mpm-ac-tile.c
+++ b/src/util-mpm-ac-tile.c
@@ -68,6 +68,8 @@
 #include "suricata-common.h"
 #include "suricata.h"
 
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+
 #include "detect.h"
 #include "detect-parse.h"
 #include "detect-engine.h"
@@ -2569,3 +2571,11 @@ void SCACTileRegisterTests(void)
 #endif
 }
 
+#else /* we're big endian */
+
+void MpmACTileRegister(void)
+{
+    /* no-op on big endian */
+}
+
+#endif /* little endian check */