From 66b863c989db740d65612454aa0f8e47f18d6874 Mon Sep 17 00:00:00 2001
From: Simon Kelley <simon@thekelleys.org.uk>
Date: Sat, 26 Jun 2021 21:13:41 +0100
Subject: [PATCH] Fix problem with re-allocation of serverarray.

---
 src/dnsmasq.h      |  2 +-
 src/domain-match.c | 10 +++++++---
 src/option.c       |  3 +--
 3 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/src/dnsmasq.h b/src/dnsmasq.h
index eeacd16..939e41e 100644
--- a/src/dnsmasq.h
+++ b/src/dnsmasq.h
@@ -1103,7 +1103,7 @@ extern struct daemon {
   struct iname *if_names, *if_addrs, *if_except, *dhcp_except, *auth_peers, *tftp_interfaces;
   struct bogus_addr *bogus_addr, *ignore_addr;
   struct server *servers, *local_domains, **serverarray, *no_rebind;
-  int serverarraysz;
+  int serverarraysz, serverarrayhwm;
   struct ipsets *ipsets;
   u32 allowlist_mask;
   struct allowlist *allowlists;
diff --git a/src/domain-match.c b/src/domain-match.c
index 473d0b2..4242d0a 100644
--- a/src/domain-match.c
+++ b/src/domain-match.c
@@ -36,18 +36,22 @@ void build_server_array(void)
   
   for (serv = daemon->local_domains; serv; serv = serv->next)
     count++;
-  
-  if (count > daemon->serverarraysz)
+
+  daemon->serverarraysz = count;
+
+  if (count > daemon->serverarrayhwm)
     {
       struct server **new;
 
+      count += 10; /* A few extra without re-allocating. */
+
       if ((new = whine_malloc(count * sizeof(struct server *))))
 	{
 	  if (daemon->serverarray)
 	    free(daemon->serverarray);
 	  
 	  daemon->serverarray = new;
-	  daemon->serverarraysz = count;
+	  daemon->serverarrayhwm = count;
 	}
     }
 
diff --git a/src/option.c b/src/option.c
index b631482..97d49be 100644
--- a/src/option.c
+++ b/src/option.c
@@ -935,8 +935,7 @@ char *parse_server(char *arg, union mysockaddr *addr, union mysockaddr *source_a
 static int domain_rev4(char *domain, struct in_addr addr, int msize)
 {
   in_addr_t a = ntohl(addr.s_addr);
-  char *p;
-
+ 
   *domain = 0;
   
   switch (msize)