From: Dmitry Vyukov <dvyukov@google.com>
Date: Fri, 30 Nov 2012 06:39:01 +0000 (+0000)
Subject: tsan: fix bug that leads to spurious use-after-free reports
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0a4d875c4825468cfbe8ec4d8c399dc606a5ec52;p=platform%2Fupstream%2Fllvm.git

tsan: fix bug that leads to spurious use-after-free reports

llvm-svn: 168985
---

diff --git a/compiler-rt/lib/tsan/rtl/tsan_rtl.cc b/compiler-rt/lib/tsan/rtl/tsan_rtl.cc
index e252728..26ad784 100644
--- a/compiler-rt/lib/tsan/rtl/tsan_rtl.cc
+++ b/compiler-rt/lib/tsan/rtl/tsan_rtl.cc
@@ -519,6 +519,7 @@ void MemoryResetRange(ThreadState *thr, uptr pc, uptr addr, uptr size) {
 void MemoryRangeFreed(ThreadState *thr, uptr pc, uptr addr, uptr size) {
   MemoryAccessRange(thr, pc, addr, size, true);
   Shadow s(thr->fast_state);
+  s.ClearIgnoreBit();
   s.MarkAsFreed();
   s.SetWrite(true);
   s.SetAddr0AndSizeLog(0, 3);
@@ -527,6 +528,7 @@ void MemoryRangeFreed(ThreadState *thr, uptr pc, uptr addr, uptr size) {
 
 void MemoryRangeImitateWrite(ThreadState *thr, uptr pc, uptr addr, uptr size) {
   Shadow s(thr->fast_state);
+  s.ClearIgnoreBit();
   s.SetWrite(true);
   s.SetAddr0AndSizeLog(0, 3);
   MemoryRangeSet(thr, pc, addr, size, s.raw());