Fix issues reported by static code analysis tool 'parfait'

Closes: #41235
Reported-by: Jiri Kukacka

src/ChangeLog

@@ -1,3 +1,11 @@
+2014-12-01  Tim Ruehsen <tim.ruehsen@gmx.de>
+
+	* connect.c, iri.c, url.c, warc.c: Fix issues reported
+	by static code analysis tool 'parfait'.
+
+	Closes: #41235
+	Reported-by: Jiri Kukacka
+
 2014-11-29  Tim Ruehsen <tim.ruehsen@gmx.de>
 
 	* utils.h: xfree() sets argument to NULL after freeing,

src/connect.c

@@ -844,7 +844,7 @@ void *
 fd_transport_context (int fd)
 {
   struct transport_info *info = hash_table_get (transport_map, (void *)(intptr_t) fd);
-  return info->ctx;
+  return info ? info->ctx : NULL;
 }
 
 /* When fd_read/fd_write are called multiple times in a loop, they should

src/iri.c

@@ -329,10 +329,13 @@ struct iri *iri_dup (const struct iri *src)
 void
 iri_free (struct iri *i)
 {
-  xfree (i->uri_encoding);
-  xfree (i->content_encoding);
-  xfree (i->orig_url);
-  xfree (i);
+  if (i)
+    {
+      xfree (i->uri_encoding);
+      xfree (i->content_encoding);
+      xfree (i->orig_url);
+      xfree (i);
+    }
 }
 
 /* Set uri_encoding of struct iri i. If a remote encoding was specified, use

src/url.c

@@ -575,8 +575,8 @@ rewrite_shorthand_url (const char *url)
         goto http;
 
       /* Turn "foo.bar.com:path" to "ftp://foo.bar.com/path". */
-      ret = aprintf ("ftp://%s", url);
-      ret[6 + (p - url)] = '/';
+      if ((ret = aprintf ("ftp://%s", url)) != NULL)
+        ret[6 + (p - url)] = '/';
     }
   else
     {
@@ -1173,20 +1173,23 @@ url_set_file (struct url *url, const char *newfile)
 void
 url_free (struct url *url)
 {
-  xfree (url->host);
-  xfree (url->path);
-  xfree (url->url);
+  if (url)
+    {
+      xfree (url->host);
+      xfree (url->path);
+      xfree (url->url);
 
-  xfree (url->params);
-  xfree (url->query);
-  xfree (url->fragment);
-  xfree (url->user);
-  xfree (url->passwd);
+      xfree (url->params);
+      xfree (url->query);
+      xfree (url->fragment);
+      xfree (url->user);
+      xfree (url->passwd);
 
-  xfree (url->dir);
-  xfree (url->file);
+      xfree (url->dir);
+      xfree (url->file);
 
-  xfree (url);
+      xfree (url);
+    }
 }
 
 /* Create all the necessary directories for PATH (a file).  Calls

src/warc.c

@@ -1201,7 +1201,10 @@ warc_tempfile (void)
 
 #if !O_TEMPORARY
   if (unlink (filename) < 0)
-    return NULL;
+    {
+      close(fd);
+      return NULL;
+    }
 #endif
 
   return fdopen (fd, "wb+");