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-rw-r--r--instrumentation/afl-compiler-rt.o.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/instrumentation/afl-compiler-rt.o.c b/instrumentation/afl-compiler-rt.o.c
index dba4dc65..e4aeadfa 100644
--- a/instrumentation/afl-compiler-rt.o.c
+++ b/instrumentation/afl-compiler-rt.o.c
@@ -1653,12 +1653,19 @@ static u8 *get_llvm_stdstring(u8 *string) {
 
 void __cmplog_rtn_gcc_stdstring_cstring(u8 *stdstring, u8 *cstring) {
 
+  if (unlikely(!__afl_cmp_map)) return;
+  if (!area_is_mapped(stdstring, 32) || !area_is_mapped(cstring, 32)) return;
+
   __cmplog_rtn_hook(get_gcc_stdstring(stdstring), cstring);
 
 }
 
 void __cmplog_rtn_gcc_stdstring_stdstring(u8 *stdstring1, u8 *stdstring2) {
 
+  if (unlikely(!__afl_cmp_map)) return;
+  if (!area_is_mapped(stdstring1, 32) || !area_is_mapped(stdstring2, 32))
+    return;
+
   __cmplog_rtn_hook(get_gcc_stdstring(stdstring1),
                     get_gcc_stdstring(stdstring2));
 
@@ -1666,12 +1673,19 @@ void __cmplog_rtn_gcc_stdstring_stdstring(u8 *stdstring1, u8 *stdstring2) {
 
 void __cmplog_rtn_llvm_stdstring_cstring(u8 *stdstring, u8 *cstring) {
 
+  if (unlikely(!__afl_cmp_map)) return;
+  if (!area_is_mapped(stdstring, 32) || !area_is_mapped(cstring, 32)) return;
+
   __cmplog_rtn_hook(get_llvm_stdstring(stdstring), cstring);
 
 }
 
 void __cmplog_rtn_llvm_stdstring_stdstring(u8 *stdstring1, u8 *stdstring2) {
 
+  if (unlikely(!__afl_cmp_map)) return;
+  if (!area_is_mapped(stdstring1, 32) || !area_is_mapped(stdstring2, 32))
+    return;
+
   __cmplog_rtn_hook(get_llvm_stdstring(stdstring1),
                     get_llvm_stdstring(stdstring2));