zlib: introduce pending close state

zlib should not crash in `close()` if the write is still in progress.

fix #7101

src/node_zlib.cc

@@ -72,18 +72,25 @@ class ZCtx : public ObjectWrap {
     , flush_(0)
     , chunk_size_(0)
     , write_in_progress_(false)
+    , pending_close_(false)
     , mode_(mode)
   {
   }
 
 
   ~ZCtx() {
+    assert(!write_in_progress_ && "write in progress");
     Close();
   }
 
 
   void Close() {
-    assert(!write_in_progress_ && "write in progress");
+    if (write_in_progress_) {
+      pending_close_ = true;
+      return;
+    }
+
+    pending_close_ = false;
     assert(init_done_ && "close before init");
     assert(mode_ <= UNZIP);
 
@@ -122,6 +129,7 @@ class ZCtx : public ObjectWrap {
     assert(ctx->mode_ != NONE && "already finalized");
 
     assert(!ctx->write_in_progress_ && "write already in progress");
+    assert(!ctx->pending_close_ && "close is pending");
     ctx->write_in_progress_ = true;
     ctx->Ref();
 
@@ -279,6 +287,8 @@ class ZCtx : public ObjectWrap {
     MakeCallback(ctx->handle_, callback_sym, ARRAY_SIZE(args), args);
 
     ctx->Unref();
+    if (ctx->pending_close_)
+      ctx->Close();
   }
 
   static void Error(ZCtx *ctx, const char *msg_) {
@@ -299,6 +309,8 @@ class ZCtx : public ObjectWrap {
     // no hope of rescue.
     ctx->write_in_progress_ = false;
     ctx->Unref();
+    if (ctx->pending_close_)
+      ctx->Close();
   }
 
   static Handle<Value> New(const Arguments& args) {
@@ -495,6 +507,7 @@ class ZCtx : public ObjectWrap {
   int chunk_size_;
 
   bool write_in_progress_;
+  bool pending_close_;
 
   uv_work_t work_req_;
   node_zlib_mode mode_;

test/simple/test-zlib-close-after-write.js

@@ -0,0 +1,38 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+var common = require('../common.js');
+var assert = require('assert');
+var zlib = require('zlib');
+
+var closed = false;
+
+zlib.gzip('hello', function(err, out) {
+  var unzip = zlib.createGunzip();
+  unzip.write(out);
+  unzip.close(function() {
+    closed = true;
+  });
+});
+
+process.on('exit', function() {
+  assert(closed);
+});