diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 24f2ba599b80..37544a357418 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -276,10 +276,18 @@ void perf_session__delete(struct perf_session *session)
 static void swap_sample_id_all(union perf_event *event, void *data)
 {
 	void *end = (void *) event + event->header.size;
-	int size = end - data;
+	int size;
 
-	BUG_ON(size % sizeof(u64));
-	mem_bswap_64(data, size);
+	if (data >= end)
+		return;
+
+	size = end - data;
+	if (size % sizeof(u64)) {
+		pr_warning("swap_sample_id_all: unaligned sample_id_all remainder (%d), skipping swap\n", size);
+		return;
+	}
+	if (size > 0)
+		mem_bswap_64(data, size);
 }
 
 static void perf_event__all64_swap(union perf_event *event,