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author | thakis@chromium.org <thakis@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2011-06-08 05:07:27 +0000 |
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committer | thakis@chromium.org <thakis@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2011-06-08 05:07:27 +0000 |
commit | e82a28a6c080a286e5fa4ed89540af7f3ba8d3b0 (patch) | |
tree | a198f523d4bc19d55d37db779bc7dad580b9f234 /base/observer_list.h | |
parent | ca1509006f8898979ca3ed268f9df6fefd121340 (diff) | |
download | chromium_src-e82a28a6c080a286e5fa4ed89540af7f3ba8d3b0.zip chromium_src-e82a28a6c080a286e5fa4ed89540af7f3ba8d3b0.tar.gz chromium_src-e82a28a6c080a286e5fa4ed89540af7f3ba8d3b0.tar.bz2 |
Revert 88151 (see crbug.com/85296) - Fix user-after-free error with ObserverList. The problem is that if an ObserverListBase::Iterator is on the stack and one of the observers deletes the object holding the list, Iterator's destructor will use the deleted list.
BUG=84919
Review URL: http://codereview.chromium.org/7127001
TBR=jam@chromium.org
Review URL: http://codereview.chromium.org/7134008
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@88284 0039d316-1c4b-4281-b951-d872f2087c98
Diffstat (limited to 'base/observer_list.h')
-rw-r--r-- | base/observer_list.h | 18 |
1 files changed, 7 insertions, 11 deletions
diff --git a/base/observer_list.h b/base/observer_list.h index d30cc6e..b8c2ae4 100644 --- a/base/observer_list.h +++ b/base/observer_list.h @@ -12,7 +12,6 @@ #include "base/basictypes.h" #include "base/logging.h" -#include "base/memory/weak_ptr.h" /////////////////////////////////////////////////////////////////////////////// // @@ -62,8 +61,7 @@ template <typename ObserverType> class ObserverListThreadSafe; template <class ObserverType> -class ObserverListBase - : public base::SupportsWeakPtr<ObserverListBase<ObserverType> > { +class ObserverListBase { public: // Enumeration of which observers are notified. enum NotificationType { @@ -81,23 +79,21 @@ class ObserverListBase class Iterator { public: Iterator(ObserverListBase<ObserverType>& list) - : list_(list.AsWeakPtr()), + : list_(list), index_(0), max_index_(list.type_ == NOTIFY_ALL ? std::numeric_limits<size_t>::max() : list.observers_.size()) { - ++list_->notify_depth_; + ++list_.notify_depth_; } ~Iterator() { - if (list_ && --list_->notify_depth_ == 0) - list_->Compact(); + if (--list_.notify_depth_ == 0) + list_.Compact(); } ObserverType* GetNext() { - if (!list_) - return NULL; - ListType& observers = list_->observers_; + ListType& observers = list_.observers_; // Advance if the current element is null size_t max_index = std::min(max_index_, observers.size()); while (index_ < max_index && !observers[index_]) @@ -106,7 +102,7 @@ class ObserverListBase } private: - base::WeakPtr<ObserverListBase<ObserverType> > list_; + ObserverListBase<ObserverType>& list_; size_t index_; size_t max_index_; }; |