don't memcpy after failed alloc (simdjson#1315)

pauldreik · web-flow · commit 68a80045186e · 2020-11-21T07:52:24.000+01:00
Should fix https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27675
diff --git a/include/simdjson/padded_string-inl.h b/include/simdjson/padded_string-inl.h
@@ -65,6 +65,11 @@ inline padded_string::padded_string(const std::string & str_ ) noexcept
 // note: do pass std::string_view arguments by value
 inline padded_string::padded_string(std::string_view sv_) noexcept
     : viable_size(sv_.size()), data_ptr(internal::allocate_padded_buffer(sv_.size())) {
+  if(simdjson_unlikely(!data_ptr)) {
+    //allocation failed or zero size
+    viable_size=0;
+    return;
+  }
   if (sv_.size()) {
     std::memcpy(data_ptr, sv_.data(), sv_.size());
   }
