[msan] Better diagnostic for invalid origin id.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@210331 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/msan/msan_report.cc b/lib/msan/msan_report.cc
index 99ea09ce9..8a3fd04cb 100644
--- a/lib/msan/msan_report.cc
+++ b/lib/msan/msan_report.cc
@@ -63,6 +63,10 @@ static void DescribeOrigin(u32 id) {
   Decorator d;
   while (true) {
     Origin o(id);
+    if (!o.isValid()) {
+      Printf("  %sinvalid origin id(%d)%s\n", d.Warning(), id, d.End());
+      break;
+    }
     u32 prev_id;
     u32 stack_id = ChainedOriginDepotGet(o.id(), &prev_id);
     Origin prev_o(prev_id);