flb_input_chunk: storage type when overlimit

When an output plugin is configured to use `storage.total_limit_size`
while the input plugin uses memory storage mode, it would previously
  continue calculating and eventually pass an empty pointer to the
  storage context in the function that releases space. This PR adds a
  validationg in the overlimit route check that will cause the check to
  be skipped, ensuring that the rest of the space freeing routines are
  never executed.

Signed-off-by: Braydon Kains <[email protected]>

src/flb_input_chunk.c

@@ -475,6 +475,8 @@ int flb_input_chunk_has_overlimit_routes(struct flb_input_chunk *ic,
     int overlimit = 0;
     struct mk_list *head;
     struct flb_output_instance *o_ins;
+    struct flb_input_instance *i_ins = ic->in;
+
 
     mk_list_foreach(head, &ic->in->config->outputs) {
         o_ins = mk_list_entry(head, struct flb_output_instance, _head);
@@ -484,6 +486,12 @@ int flb_input_chunk_has_overlimit_routes(struct flb_input_chunk *ic,
             continue;
         }
 
+        if (i_ins->storage_type == CIO_STORE_MEM) {
+            flb_plg_debug(i_ins, "plugin is in memory storage mode, storage.total_limit_size "
+                                "from output %s has no effect", o_ins->name);
+            continue;
+        }
+
         FS_CHUNK_SIZE_DEBUG(o_ins);
         flb_debug("[input chunk] chunk %s required %ld bytes and %ld bytes left "
                   "in plugin %s", flb_input_chunk_get_name(ic), chunk_size,
@@ -508,6 +516,7 @@ int flb_input_chunk_has_overlimit_routes(struct flb_input_chunk *ic,
 int flb_input_chunk_place_new_chunk(struct flb_input_chunk *ic, size_t chunk_size)
 {
 	int overlimit;
+
     overlimit = flb_input_chunk_has_overlimit_routes(ic, chunk_size);
     if (overlimit != 0) {
         flb_input_chunk_find_space_new_data(ic, chunk_size, overlimit);