[llvm-commits] [compiler-rt] r152347 - /compiler-rt/trunk/lib/asan/asan_stack.cc

[Kostya Serebryany]

Author: kcc
Date: Thu Mar  8 16:25:08 2012
New Revision: 152347

URL: http://llvm.org/viewvc/llvm-project?rev=152347&view=rev
Log:
[asan]: fix off-by-one error in stack unwinder (asan issue #44; reproduced thanks to 'csmith' fuzzer)

Modified:
    compiler-rt/trunk/lib/asan/asan_stack.cc

Modified: compiler-rt/trunk/lib/asan/asan_stack.cc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/asan/asan_stack.cc?rev=152347&r1=152346&r2=152347&view=diff
==============================================================================
--- compiler-rt/trunk/lib/asan/asan_stack.cc (original)
+++ compiler-rt/trunk/lib/asan/asan_stack.cc Thu Mar  8 16:25:08 2012
@@ -69,7 +69,7 @@
   uintptr_t *top = (uintptr_t*)t->stack_top();
   uintptr_t *bottom = (uintptr_t*)t->stack_bottom();
   while (frame >= prev_frame &&
-         frame < top &&
+         frame < top - 2 &&
          frame > bottom &&
          size < max_size) {
     uintptr_t pc1 = frame[1];