fix uninitialized field (#2)

replit · Sep 11, 2024 · 0442b07 · 0442b07
1 parent b633f0c
commit 0442b07
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diff --git a/.gitignore b/.gitignore
@@ -1,2 +1,3 @@
 ./replit-ebpf
 ./result
+.direnv/
diff --git a/bdwatch.c b/bdwatch.c
@@ -60,6 +60,10 @@ int BPF_KPROBE(btrfs_recover_log_trees, struct btrfs_root *root_tree) {
     BPF_CORE_READ_INTO(&evt.label, root_tree, fs_info, super_copy, label);
     BPF_CORE_READ_INTO(&evt.fsid, root_tree, fs_info, super_copy, fsid);
 
+    // This will be filled later in kretprobe but the verifier
+    // requires all fields to be initialized.
+    evt.ret = 0;
+
     bool *registered = bpf_map_lookup_elem(&registered_devices, &evt.dev_id);
     if (registered == NULL || !*registered) {
         return 0;

diff --git a/bdwatch_x86_bpfel.o b/bdwatch_x86_bpfel.o