PulseAudio: do not assume sysconf() returns a finite value

(Here -1 means infinity.)

modules/audio_output/vlcpulse.c

@@ -117,18 +117,27 @@ pa_context *vlc_pa_connect (vlc_object_t *obj, pa_threaded_mainloop **mlp)
         //pa_proplist_sets (props, PA_PROP_APPLICATION_PROCESS_BINARY,
         //                  PACKAGE_NAME);
 
-        char buf[sysconf (_SC_GETPW_R_SIZE_MAX)];
+        for (size_t max = sysconf (_SC_GETPW_R_SIZE_MAX), len = max % 1024 + 1024;
+             len < max; len += 1024)
+        {
             struct passwd pwbuf, *pw;
+            char buf[len];
 
             if (getpwuid_r (getuid (), &pwbuf, buf, sizeof (buf), &pw) == 0
              && pw != NULL)
                 pa_proplist_sets (props, PA_PROP_APPLICATION_PROCESS_USER,
                                   pw->pw_name);
+        }
+
+        for (size_t max = sysconf (_SC_HOST_NAME_MAX), len = max % 1024 + 1024;
+             len < max; len += 1024)
+        {
+            char hostname[len];
 
-        char hostname[sysconf (_SC_HOST_NAME_MAX)];
             if (gethostname (hostname, sizeof (hostname)) == 0)
                 pa_proplist_sets (props, PA_PROP_APPLICATION_PROCESS_HOST,
                                   hostname);
+        }
 
         const char *session = getenv ("XDG_SESSION_COOKIE");
         if (session != NULL)