From 394356f73c026879672843fbb20b4de68a09d0ac Mon Sep 17 00:00:00 2001
From: Sascha Steinbiss <satta@debian.org>
Date: Wed, 27 Apr 2022 20:09:50 +0200
Subject: [PATCH] detect: make int CIDRFromMask() work on big endian platforms

---
 src/util-cidr.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/src/util-cidr.c b/src/util-cidr.c
index 06a0c30bc2..bdab3063c2 100644
--- a/src/util-cidr.c
+++ b/src/util-cidr.c
@@ -31,25 +31,24 @@
  */
 int CIDRFromMask(uint32_t netmask)
 {
+    netmask = ntohl(netmask);
     if (netmask == 0) {
         return 0;
     }
-    int lead_1 = 0;
-    bool seen_0 = false;
-    for (int i = 0; i < 32; i++) {
-        if (!seen_0) {
-            if ((netmask & BIT_U32(i)) != 0) {
-                lead_1++;
-            } else {
-                seen_0 = true;
-            }
+    int p = 0;
+    bool seen_1 = false;
+    while (netmask > 0) {
+        if (netmask & 1) {
+            seen_1 = true;
+            p++;
         } else {
-            if ((netmask & BIT_U32(i)) != 0) {
+            if (seen_1) {
                 return -1;
             }
         }
+        netmask >>= 1;
     }
-    return lead_1;
+    return p;
 }
 
 uint32_t CIDRGet(int cidr)
-- 
2.47.2