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-rw-r--r--instrumentation/afl-llvm-dict2file.so.cc7
1 files changed, 6 insertions, 1 deletions
diff --git a/instrumentation/afl-llvm-dict2file.so.cc b/instrumentation/afl-llvm-dict2file.so.cc
index 58f01920..9daa75a8 100644
--- a/instrumentation/afl-llvm-dict2file.so.cc
+++ b/instrumentation/afl-llvm-dict2file.so.cc
@@ -541,7 +541,12 @@ bool AFLdict2filePass::runOnModule(Module &M) {
 
               uint64_t literalLength = optLen;
               optLen = ilen->getZExtValue();
-              if (optLen > thestring.length()) { optLen = thestring.length(); }
+              if (optLen > thestring.length() + 1) {
+
+                optLen = thestring.length() + 1;
+
+              }
+
               if (optLen < 2) { continue; }
               if (literalLength + 1 == optLen) {  // add null byte
                 thestring.append("\0", 1);