fix potential overflow

src/local.c

@@ -911,8 +911,10 @@ int main(int argc, char **argv)
             }
             break;
         case 's':
-            remote_addr[remote_num].host = optarg;
-            remote_addr[remote_num++].port = NULL;
+            if (remote_num < MAX_REMOTE_NUM) {
+                remote_addr[remote_num].host = optarg;
+                remote_addr[remote_num++].port = NULL;
+            }
             break;
         case 'p':
             remote_port = optarg;

src/redir.c

@@ -613,8 +613,10 @@ int main(int argc, char **argv)
     while ((c = getopt(argc, argv, "f:s:p:l:k:t:m:c:b:a:")) != -1) {
         switch (c) {
         case 's':
-            remote_addr[remote_num].host = optarg;
-            remote_addr[remote_num++].port = NULL;
+            if (remote_num < MAX_REMOTE_NUM) {
+                remote_addr[remote_num].host = optarg;
+                remote_addr[remote_num++].port = NULL;
+            }
             break;
         case 'p':
             remote_port = optarg;

src/server.c

@@ -1043,7 +1043,9 @@ int main(int argc, char **argv)
             }
             break;
         case 's':
-            server_host[server_num++] = optarg;
+            if (server_num < MAX_REMOTE_NUM) {
+                server_host[server_num++] = optarg;
+            }
             break;
         case 'p':
             server_port = optarg;

src/tunnel.c

@@ -655,8 +655,10 @@ int main(int argc, char **argv)
     while ((c = getopt(argc, argv, "f:s:p:l:k:t:m:i:c:b:L:a:uv")) != -1) {
         switch (c) {
         case 's':
-            remote_addr[remote_num].host = optarg;
-            remote_addr[remote_num++].port = NULL;
+            if (remote_num < MAX_REMOTE_NUM) {
+                remote_addr[remote_num].host = optarg;
+                remote_addr[remote_num++].port = NULL;
+            }
             break;
         case 'p':
             remote_port = optarg;