Disk Cache: Perform extra validations to data comming from

disk to detect obvious corruption going undetected.

BUG=77841
TEST=net_unittests
Review URL: http://codereview.chromium.org/6821064

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@81472 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 15 insertions, 1 deletions

diff --git a/net/disk_cache/addr.cc b/net/disk_cache/addr.cc
index aa84c01..c4b95ef 100644
--- a/net/disk_cache/addr.cc
+++ b/net/disk_cache/addr.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
@@ -26,4 +26,18 @@ bool Addr::SetFileNumber(int file_number) {
   return true;
 }
 
+bool Addr::SanityCheck() const {
+  if (!is_initialized())
+    return !value_;
+
+  if (((value_ & kFileTypeMask) >> kFileTypeOffset) > 4)
+    return false;
+
+  if (is_separate_file())
+    return true;
+
+  const uint32 kReservedBitsMask = 0x0c000000;
+  return !(value_ & kReservedBitsMask);
+}
+
 }  // namespace disk_cache