src: fix null deref in AllocatedBuffer::clear

An empty buffer can have a null environment. Previously, we were getting away with with this, but -fsanitize=null in clang caught it. PR-URL: #32892 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: David Carlier <[email protected]> Reviewed-By: Jan Krems <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Juan José Arboleda <[email protected]>
nodejs · Apr 27, 2020 · 4221b1c · 4221b1c
1 parent fa71073
commit 4221b1c
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/src/env-inl.h b/src/env-inl.h
@@ -995,7 +995,10 @@ inline AllocatedBuffer::~AllocatedBuffer() {
 
 inline void AllocatedBuffer::clear() {
   uv_buf_t buf = release();
-  env_->Free(buf.base, buf.len);
+  if (buf.base != nullptr) {
+    CHECK_NOT_NULL(env_);
+    env_->Free(buf.base, buf.len);
+  }
 }
 
 // It's a bit awkward to define this Buffer::New() overload here, but it