restart: add error handling when a tag is not found in a metadata file.

1 files changed, 5 insertions, 0 deletions

diff --git a/restart.c b/restart.c
index 74faf75..1ce6799 100644
--- a/restart.c
+++ b/restart.c
@@ -82,6 +82,7 @@ static int restart_check(const char *file) {
     restart_cb_ctx ctx;
 
     ctx.f = f;
+    ctx.cb = NULL;
     ctx.line = NULL;
     ctx.done = false;
     if (restart_get_kv(&ctx, NULL, NULL) != RESTART_DONE) {
@@ -91,6 +92,10 @@ static int restart_check(const char *file) {
         // TODO: this should probably just return -1 and skip the reuse.
         abort();
     }
+    if (ctx.cb == NULL) {
+        fprintf(stderr, "[restart] Failed to read a tag from metadata file\n");
+        abort();
+    }
 
     // loop call the callback, check result code.
     bool failed = false;