From 31e106ced2b37e1cb1b54f9f5f5d56df82577ede Mon Sep 17 00:00:00 2001
From: Yang Tse <yangsita@gmail.com>
Date: Thu, 17 Sep 2009 11:45:27 +0000
Subject: [PATCH] Attempt to silence bogus compiler warning: "Potential null
 pointer dereference"

---
 ares/ares_getnameinfo.c | 19 +++++++++----------
 ares/ares_init.c        |  9 ++++++---
 lib/url.c               |  8 +++++---
 tests/server/sws.c      |  1 +
 4 files changed, 21 insertions(+), 16 deletions(-)

diff --git a/ares/ares_getnameinfo.c b/ares/ares_getnameinfo.c
index 38f559947..2c5cf0e08 100644
--- a/ares/ares_getnameinfo.c
+++ b/ares/ares_getnameinfo.c
@@ -99,12 +99,19 @@ void ares_getnameinfo(ares_channel channel, const struct sockaddr *sa,
   struct sockaddr_in *addr = NULL;
   struct sockaddr_in6 *addr6 = NULL;
   struct nameinfo_query *niquery;
+  unsigned int port = 0;
 
   /* Verify the buffer size */
   if (salen == sizeof(struct sockaddr_in))
-    addr = (struct sockaddr_in *)sa;
+    {
+      addr = (struct sockaddr_in *)sa;
+      port = addr->sin_port;
+    }
   else if (salen == sizeof(struct sockaddr_in6))
-    addr6 = (struct sockaddr_in6 *)sa;
+    {
+      addr6 = (struct sockaddr_in6 *)sa;
+      port = addr6->sin6_port;
+    }
   else
     {
       callback(arg, ARES_ENOTIMP, 0, NULL, NULL);
@@ -119,12 +126,7 @@ void ares_getnameinfo(ares_channel channel, const struct sockaddr *sa,
   if ((flags & ARES_NI_LOOKUPSERVICE) && !(flags & ARES_NI_LOOKUPHOST))
     {
       char buf[33], *service;
-      unsigned int port = 0;
 
-      if (salen == sizeof(struct sockaddr_in))
-        port = addr->sin_port;
-      else
-        port = addr6->sin6_port;
       service = lookup_service((unsigned short)(port & 0xffff),
                                flags, buf, sizeof(buf));
       callback(arg, ARES_SUCCESS, 0, NULL, service);
@@ -137,7 +139,6 @@ void ares_getnameinfo(ares_channel channel, const struct sockaddr *sa,
      /* A numeric host can be handled without DNS */
      if ((flags & ARES_NI_NUMERICHOST))
       {
-        unsigned int port = 0;
         char ipbuf[IPBUFSIZ];
         char srvbuf[33];
         char *service = NULL;
@@ -154,7 +155,6 @@ void ares_getnameinfo(ares_channel channel, const struct sockaddr *sa,
         if (salen == sizeof(struct sockaddr_in6))
           {
             ares_inet_ntop(AF_INET6, &addr6->sin6_addr, ipbuf, IPBUFSIZ);
-            port = addr6->sin6_port;
             /* If the system supports scope IDs, use it */
 #ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
             append_scopeid(addr6, flags, ipbuf, sizeof(ipbuf));
@@ -163,7 +163,6 @@ void ares_getnameinfo(ares_channel channel, const struct sockaddr *sa,
         else
           {
             ares_inet_ntop(AF_INET, &addr->sin_addr, ipbuf, IPBUFSIZ);
-            port = addr->sin_port;
           }
         /* They also want a service */
         if (flags & ARES_NI_LOOKUPSERVICE)
diff --git a/ares/ares_init.c b/ares/ares_init.c
index ac626e9ce..bc7e97ad6 100644
--- a/ares/ares_init.c
+++ b/ares/ares_init.c
@@ -975,6 +975,9 @@ static int init_by_defaults(ares_channel channel)
 {
   char *hostname = NULL;
   int rc = ARES_SUCCESS;
+#ifdef HAVE_GETHOSTNAME
+  char *dot;
+#endif
 
   if (channel->flags == -1)
     channel->flags = 0;
@@ -1044,15 +1047,15 @@ static int init_by_defaults(ares_channel channel)
 
     } while(0);
 
-    if (strchr(hostname, '.'))  {
+    dot = strchr(hostname, '.');
+    if (dot) {
       /* a dot was found */
-
       channel->domains = malloc(sizeof(char *));
       if (!channel->domains) {
         rc = ARES_ENOMEM;
         goto error;
       }
-      channel->domains[0] = strdup(strchr(hostname, '.') + 1);
+      channel->domains[0] = strdup(dot + 1);
       if (!channel->domains[0]) {
         rc = ARES_ENOMEM;
         goto error;
diff --git a/lib/url.c b/lib/url.c
index 011f6c4d7..729149c3d 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -3946,9 +3946,11 @@ static CURLcode parse_remote_port(struct SessionHandle *data,
 
     conn->host.name++; /* skip over the starting bracket */
     portptr = strchr(conn->host.name, ']');
-    *portptr++ = 0; /* zero terminate, killing the bracket */
-    if(':' != *portptr)
-      portptr = NULL; /* no port number available */
+    if(portptr) {
+      *portptr++ = '\0'; /* zero terminate, killing the bracket */
+      if(':' != *portptr)
+        portptr = NULL; /* no port number available */
+    }
   }
   else
     portptr = strrchr(conn->host.name, ':');
diff --git a/tests/server/sws.c b/tests/server/sws.c
index 7902c035f..84a5b34b0 100644
--- a/tests/server/sws.c
+++ b/tests/server/sws.c
@@ -584,6 +584,7 @@ static int get_request(curl_socket_t sock, struct httprequest *req)
   /*** end of httprequest init ***/
 
   while (req->offset < REQBUFSIZ-1) {
+    if(pipereq_length && pipereq) {
     if(pipereq_length) {
       memmove(reqbuf, pipereq, pipereq_length);
       got = pipereq_length;