3 files changed, 10 insertions, 2 deletions

diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c
index 918b4de29de4..6419f57b0850 100644
--- a/tools/perf/builtin-buildid-list.c
+++ b/tools/perf/builtin-buildid-list.c
@@ -110,7 +110,7 @@ int cmd_buildid_list(int argc, const char **argv,
         setup_pager();
 
         if (show_kernel)
-                return sysfs__fprintf_build_id(stdout);
+                return !(sysfs__fprintf_build_id(stdout) > 0);
 
         return perf_session__list_build_ids(force, with_hits);
 }
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index fa9eb92c9e24..81def6c3f24b 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -298,6 +298,9 @@ static bool hist_browser__toggle_fold(struct hist_browser *browser)
         struct callchain_list *cl = container_of(ms, struct callchain_list, ms);
         bool has_children;
 
+        if (!he || !ms)
+                return false;
+
         if (ms == &he->ms)
                 has_children = hist_entry__toggle_fold(he);
         else
@@ -928,6 +931,8 @@ static unsigned int hist_browser__refresh(struct ui_browser *browser)
         }
 
         ui_browser__hists_init_top(browser);
+        hb->he_selection = NULL;
+        hb->selection = NULL;
 
         for (nd = browser->top; nd; nd = rb_next(nd)) {
                 struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);
@@ -1033,6 +1038,9 @@ static void ui_browser__hists_seek(struct ui_browser *browser,
          * and stop when we printed enough lines to fill the screen.
          */
 do_offset:
+        if (!nd)
+                return;
+
         if (offset > 0) {
                 do {
                         h = rb_entry(nd, struct hist_entry, rb_node);
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 217b5a60e2ab..6a7e273a514a 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -91,7 +91,7 @@ int build_id__sprintf(const u8 *build_id, int len, char *bf)
                 bid += 2;
         }
 
-        return raw - build_id;
+        return (bid - bf) + 1;
 }
 
 int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)