Fix verifier error

.gitmodules

@@ -1,4 +1,4 @@
 [submodule "third_party/stackrox"]
 	path = third_party/stackrox
 	url = https://github.com/stackrox/stackrox
-	branch = master
+	branch = jv-ROX-31434-enrich-file-system-events-with-node-details

fact-ebpf/src/bpf/bound_path.h

@@ -23,6 +23,9 @@ __always_inline static void path_write_char(char* p, unsigned int offset, char c
 
 __always_inline static struct bound_path_t* path_read(struct path* path) {
   struct bound_path_t* bound_path = get_bound_path();
+  if (bound_path == NULL) {
+    return NULL;
+  }
 
   bound_path->len = bpf_d_path(path, bound_path->path, PATH_MAX);
   if (bound_path->len <= 0) {

fact-ebpf/src/bpf/events.h

@@ -17,9 +17,11 @@ __always_inline static void submit_event(struct metrics_by_hook_t* m, file_activ
   bpf_probe_read_str(event->filename, PATH_MAX, filename);
 
   struct helper_t* helper = get_helper();
-  const char* p = get_host_path(helper->buf, dentry);
-  if (p != NULL) {
-    bpf_probe_read_str(event->host_file, PATH_MAX, p);
+  if (helper != NULL) {
+    const char* p = get_host_path(helper->buf, dentry);
+    if (p != NULL) {
+      bpf_probe_read_str(event->host_file, PATH_MAX, p);
+    }
   }
 
   int64_t err = process_fill(&event->process);

fact-ebpf/src/bpf/main.c

@@ -22,6 +22,9 @@ char _license[] SEC("license") = "Dual MIT/GPL";
 SEC("lsm/file_open")
 int BPF_PROG(trace_file_open, struct file* file) {
   struct metrics_t* m = get_metrics();
+  if (m == NULL) {
+    return 0;
+  }
 
   m->file_open.total++;
 
@@ -58,6 +61,9 @@ int BPF_PROG(trace_file_open, struct file* file) {
 SEC("lsm/path_unlink")
 int BPF_PROG(trace_path_unlink, struct path* dir, struct dentry* dentry) {
   struct metrics_t* m = get_metrics();
+  if (m == NULL) {
+    return 0;
+  }
 
   m->path_unlink.total++;
 

fact-ebpf/src/bpf/maps.h

@@ -38,6 +38,9 @@ struct {
 __always_inline static bool filter_by_prefix() {
   unsigned int zero = 0;
   char* res = bpf_map_lookup_elem(&filter_by_prefix_map, &zero);
+  if (res == NULL) {
+    return false;
+  }
   return *res != 0;
 }
 

fact/src/event/mod.rs

@@ -89,6 +89,7 @@ impl From<Event> for fact_api::FileActivity {
             file: Some(file),
             timestamp: Some(timestamp),
             process: Some(process),
+            node: value.hostname.to_string(),
         }
     }
 }