vat2: coverity errors in print_template

Dereferencing null pointer fix.
Add checking of return values for all calls in print_template()

Type: fix
Signed-off-by: Ole Troan <ot@cisco.com>
Change-Id: I00073b29ab2e76d5d06af9bd3f5ae2846de4d46d

1 files changed, 19 insertions, 4 deletions

diff --git a/src/vat2/main.c b/src/vat2/main.c
index b3606f3dd98..208e0c5d2c2 100644
--- a/src/vat2/main.c
+++ b/src/vat2/main.c
@@ -151,21 +151,36 @@ print_template (char *msgname)
 {
   uword *p = hash_get_mem (function_by_name, msgname);
   if (!p)
-    {
-      fprintf (stderr, "no such message: %s", msgname);
-    }
+    goto error;
+
   cJSON *(*fp) (void *);
   fp = (void *) apifuncs[p[0]].tojson;
-  assert (fp);
+  if (!fp)
+    goto error;
+
   void *scratch = malloc (2048);
+  if (!scratch)
+    goto error;
+
   memset (scratch, 0, 2048);
   cJSON *t = fp (scratch);
+  if (!t)
+    goto error;
   free (scratch);
   char *output = cJSON_Print (t);
+  if (!output)
+    goto error;
+
   cJSON_Delete (t);
   printf ("%s\n", output);
   free (output);
+
+  return;
+
+error:
+  fprintf (stderr, "error printing template for: %s\n", msgname);
 }
+
 static void
 dump_apis (void)
 {