[msan] Better use-after-free reports.

By attaching an extra integer tag to heap origins, we are able
to distinguish between uninits
 - created by heap allocation,
 - created by heap deallocation (i.e. use-after-free),
 - created by __msan_allocated_memory call,
 - etc.

See https://code.google.com/p/memory-sanitizer/issues/detail?id=35.



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@226821 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/sanitizer_common/sanitizer_stacktrace.cc b/lib/sanitizer_common/sanitizer_stacktrace.cc
index 17b2ef357..2deadb6e3 100644
--- a/lib/sanitizer_common/sanitizer_stacktrace.cc
+++ b/lib/sanitizer_common/sanitizer_stacktrace.cc
@@ -68,7 +68,7 @@ static inline uhwptr *GetCanonicFrame(uptr bp,
 }
 
 void BufferedStackTrace::FastUnwindStack(uptr pc, uptr bp, uptr stack_top,
-                                         uptr stack_bottom, uptr max_depth) {
+                                         uptr stack_bottom, u32 max_depth) {
   CHECK_GE(max_depth, 2);
   trace_buffer[0] = pc;
   size = 1;