misc: pass NULL instead of 0 for pointer in variadic functions

0 is not NULL (at least not in all cases), passing 0 into a variadic
function in a place where the consumer reads it as pointer might
leave parts of the pointer uninitilized and hence filled with random
data.

It seems that this used to work with gcc, but clang seems to treat the
0 in those places as a 32bit integer.

Type: fix

Signed-off-by: Ivan Shvedunov <ivan4th@gmail.com>
Signed-off-by: Andreas Schultz <andreas.schultz@travelping.com>
Change-Id: I37d975eef5a1ad98fbfb65ebe47d73458aafea00

5 files changed, 14 insertions, 18 deletions

diff --git a/src/plugins/mactime/mactime_top.c b/src/plugins/mactime/mactime_top.c
index abcb530608c..d7223f45e56 100644
--- a/src/plugins/mactime/mactime_top.c
+++ b/src/plugins/mactime/mactime_top.c
@@ -441,7 +441,7 @@ print_device_table (mt_main_t * mm)
 {
   mactime_device_t *dev;
 
-  fformat (stdout, "%U", format_device, 0 /* header */ , 0 /* verbose */ );
+  fformat (stdout, "%U", format_device, NULL /* header */, 0 /* verbose */);
   /* *INDENT-OFF* */
   pool_foreach (dev, mm->devices)
    {
diff --git a/src/vlib/log.c b/src/vlib/log.c
index a7791e4fee5..d084511a647 100644
--- a/src/vlib/log.c
+++ b/src/vlib/log.c
@@ -413,10 +413,9 @@ show_log (vlib_main_t * vm,
   while (count--)
     {
       e = vec_elt_at_index (lm->entries, i);
-      vlib_cli_output (vm, "%U %-10U %-14U %v",
-		       format_time_float, 0, e->timestamp + time_offset,
-		       format_vlib_log_level, e->level,
-		       format_vlib_log_class, e->class, e->string);
+      vlib_cli_output (vm, "%U %-10U %-14U %v", format_time_float, NULL,
+		       e->timestamp + time_offset, format_vlib_log_level,
+		       e->level, format_vlib_log_class, e->class, e->string);
       i = (i + 1) % lm->size;
     }
 
diff --git a/src/vlib/unix/cli.c b/src/vlib/unix/cli.c
index cb8aa9f165a..a647dd78250 100644
--- a/src/vlib/unix/cli.c
+++ b/src/vlib/unix/cli.c
@@ -2576,9 +2576,8 @@ more:
     {
       static u8 *lv;
       vec_reset_length (lv);
-      lv = format (lv, "%U[%d]: %v",
-		   format_timeval, 0 /* current bat-time */ ,
-		   0 /* current bat-format */ ,
+      lv = format (lv, "%U[%d]: %v", format_timeval,
+		   NULL /* current bat-format */, 0 /* current bat-time */,
 		   cli_file_index, cf->current_command);
       if ((vec_len (cf->current_command) > 0) &&
 	  (cf->current_command[vec_len (cf->current_command) - 1] != '\n'))
diff --git a/src/vlib/unix/main.c b/src/vlib/unix/main.c
index fd8a7e863a1..6b1a32cfee6 100644
--- a/src/vlib/unix/main.c
+++ b/src/vlib/unix/main.c
@@ -327,17 +327,16 @@ startup_config_process (vlib_main_t * vm,
 	{
 	  u8 *lv = 0;
 	  lv = format (lv, "%U: ***** Startup Config *****\n%v",
-		       format_timeval, 0 /* current bat-time */ ,
-		       0 /* current bat-format */ ,
-		       buf);
+		       format_timeval, NULL /* current bat-format */,
+		       0 /* current bat-time */, buf);
 	  {
 	    int rv __attribute__ ((unused)) =
 	      write (um->log_fd, lv, vec_len (lv));
 	  }
 	  vec_reset_length (lv);
-	  lv = format (lv, "%U: ***** End Startup Config *****\n",
-		       format_timeval, 0 /* current bat-time */ ,
-		       0 /* current bat-format */ );
+	  lv =
+	    format (lv, "%U: ***** End Startup Config *****\n", format_timeval,
+		    NULL /* current bat-format */, 0 /* current bat-time */);
 	  {
 	    int rv __attribute__ ((unused)) =
 	      write (um->log_fd, lv, vec_len (lv));
@@ -477,9 +476,8 @@ unix_config (vlib_main_t * vm, unformat_input_t * input)
 	    {
 	      u8 *lv = 0;
 	      lv = format (0, "%U: ***** Start: PID %d *****\n",
-			   format_timeval, 0 /* current bat-time */ ,
-			   0 /* current bat-format */ ,
-			   getpid ());
+			   format_timeval, NULL /* current bat-format */,
+			   0 /* current bat-time */, getpid ());
 	      {
 		int rv __attribute__ ((unused)) =
 		  write (um->log_fd, lv, vec_len (lv));
diff --git a/src/vnet/session/application.c b/src/vnet/session/application.c
index 7f88c7a5ff0..67dc7d633ec 100644
--- a/src/vnet/session/application.c
+++ b/src/vnet/session/application.c
@@ -1681,7 +1681,7 @@ application_format_listeners (application_t * app, int verbose)
 
   if (!app)
     {
-      vlib_cli_output (vm, "%U", format_app_worker_listener, 0 /* header */ ,
+      vlib_cli_output (vm, "%U", format_app_worker_listener, NULL /* header */,
 		       0, 0, verbose);
       return;
     }