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Commit 0840cdd0 authored by Ady Abraham's avatar Ady Abraham
Browse files

RESTRICT AUTOMERGE SurfaceFlinger: fix a potential race condition in stealReceiveChannel 

Add a mutex to prevent a potential race condition.

Bug: 232541124
Test: See bug for details
Change-Id: Ia338f124c786bf12d6adba10a67b9048fe9c34a5
parent 224d576c

services/surfaceflinger/Scheduler/EventThread.cpp

+5 −0
Original line number Diff line number Diff line
@@ -123,6 +123,11 @@ void EventThreadConnection::onFirstRef() { 
}



status_t EventThreadConnection::stealReceiveChannel(gui::BitTube* outChannel) {

    std::scoped_lock lock(mLock);

    if (mChannel.initCheck() != NO_ERROR) {

        return NAME_NOT_FOUND;

    }



    outChannel->setReceiveFd(mChannel.moveReceiveFd());

    return NO_ERROR;

}

services/surfaceflinger/Scheduler/EventThread.h

+2 −1
Original line number Diff line number Diff line
@@ -86,7 +86,8 @@ public: 
private:

    virtual void onFirstRef();

    EventThread* const mEventThread;

    gui::BitTube mChannel;

    std::mutex mLock;

    gui::BitTube mChannel GUARDED_BY(mLock);

};



class EventThread {