Http cache: Don't access entry_ if an error switches...

net/http/http_cache_transaction.cc

 // Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/http/http_cache_transaction.h"
 
 #include "base/compiler_specific.h"
 
 #if defined(OS_POSIX)
 #include <unistd.h>
@@ skipping 1215 matching lines @@
   return HandleResult(result);
 }
 
 int HttpCache::Transaction::DoPartialCacheReadCompleted(int result) {
   partial_->OnCacheReadCompleted(result);
 
   if (result == 0) {  // End of file.
     if (partial_.get() && mode_ == READ_WRITE) {
       // We need to move on to the next range.
       result = ContinuePartialCacheValidation();
-      if (result != OK)
+      if (result != OK || !entry_) {
         // Any error was already handled.
         return result;
+      }
       cache_->ConvertWriterToReader(entry_);
     }
     cache_->DoneReadingFromEntry(entry_, this);
     entry_ = NULL;
   }
   return HandleResult(result);
 }
 
 int HttpCache::Transaction::DoCacheWriteCompleted(int result) {
   DCHECK(cache_);
@@ skipping 147 matching lines @@
 void HttpCache::Transaction::OnCacheWriteCompleted(int result) {
   DoCacheWriteCompleted(result);
 }
 
 void HttpCache::Transaction::OnCacheEntryReady(int result) {
   DCHECK_EQ(OK, result);
   ValidateEntryHeadersAndContinue(true);
 }
 
 }  // namespace net