commit c9dc96bfc6641e3d92560dfedb9ebac83f6b168c
author Kostya Serebryany <kcc@google.com> Thu Jul 30 21:22:22 2015 +0000
committer Kostya Serebryany <kcc@google.com> Thu Jul 30 21:22:22 2015 +0000
tree 3fca0558e2af77fe8094bbc9e30c7ec25bef4a6c
parent a67833bb35a312e208af6eb704f49d1442d032aa

[libFuzzer] fix the strncmp interceptor -- it should respect short strings. 

llvm-svn: 243691

llvm/lib/Fuzzer/test/StrncmpTest.cpp

diff --git a/llvm/lib/Fuzzer/test/StrncmpTest.cpp b/llvm/lib/Fuzzer/test/StrncmpTest.cpp
index 86b02d0..187a2fd 100644
--- a/llvm/lib/Fuzzer/test/StrncmpTest.cpp
+++ b/llvm/lib/Fuzzer/test/StrncmpTest.cpp
@@ -4,9 +4,13 @@
 #include <cstdio>
 #include <cstdlib>
 
+static volatile int sink;
+
 extern "C" void LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
   // TODO: check other sizes.
   char *S = (char*)Data;
+  if (Size >= 8 && strncmp(S, "123", 8))
+    sink = 1;
   if (Size >= 8 && strncmp(S, "01234567", 8) == 0) {
     if (Size >= 12 && strncmp(S + 8, "ABCD", 4) == 0) {
       if (Size >= 14 && strncmp(S + 12, "XY", 2) == 0) {