diff --git a/compiler-rt/lib/asan/asan_allocator.cpp b/compiler-rt/lib/asan/asan_allocator.cpp
--- a/compiler-rt/lib/asan/asan_allocator.cpp
+++ b/compiler-rt/lib/asan/asan_allocator.cpp
@@ -714,9 +714,16 @@
 
     void *new_ptr = Allocate(new_size, 8, stack, FROM_MALLOC, true);
     if (new_ptr) {
-      u8 chunk_state = atomic_load(&m->chunk_state, memory_order_acquire);
-      if (chunk_state != CHUNK_ALLOCATED)
-        ReportInvalidFree(old_ptr, chunk_state, stack);
+      // On Windows, uninstrumented DLLs may allocate memory before ASan hooks
+      // malloc. Don't report an invalid free in this case.
+      if (SANITIZER_WINDOWS && !get_allocator().PointerIsMine(old_ptr)) {
+        if (!IsSystemHeapAddress(p))
+          ReportFreeNotMalloced(p, stack);
+      } else {
+        u8 chunk_state = atomic_load(&m->chunk_state, memory_order_acquire);
+        if (chunk_state != CHUNK_ALLOCATED)
+          ReportInvalidFree(old_ptr, chunk_state, stack);
+      }
       CHECK_NE(REAL(memcpy), nullptr);
       uptr memcpy_size = Min(new_size, m->UsedSize());
       // If realloc() races with free(), we may start copying freed memory.