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libvncserver: Add thread protection for updateBuf #607

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libvncserver: Add thread protection for updateBuf #607

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6 changes: 6 additions & 0 deletions include/rfb/rfb.h
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Original file line number Diff line number Diff line change
Expand Up @@ -707,6 +707,12 @@ typedef struct _rfbClientRec {
int tightPngDstDataLen;
#endif
#endif

/** for thread safety for updateBuf in rfbSendFBUpdate() */
#if defined(LIBVNCSERVER_HAVE_LIBPTHREAD) || defined(LIBVNCSERVER_HAVE_WIN32THREADS)
MUTEX(updateBufMutex);
#endif

} rfbClientRec, *rfbClientPtr;

/**
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4 changes: 4 additions & 0 deletions src/libvncserver/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1299,7 +1299,9 @@ rfbUpdateClient(rfbClientPtr cl)
!sraRgnEmpty(cl->requestedRegion)) {
result=TRUE;
if(screen->deferUpdateTime == 0) {
LOCK(cl->updateBufMutex);
rfbSendFramebufferUpdate(cl,cl->modifiedRegion);
UNLOCK(cl->updateBufMutex);
} else if(cl->startDeferring.tv_usec == 0) {
gettimeofday(&cl->startDeferring,NULL);
if(cl->startDeferring.tv_usec == 0)
Expand All @@ -1311,7 +1313,9 @@ rfbUpdateClient(rfbClientPtr cl)
+(tv.tv_usec-cl->startDeferring.tv_usec)/1000)
> screen->deferUpdateTime) {
cl->startDeferring.tv_usec = 0;
LOCK(cl->updateBufMutex);
rfbSendFramebufferUpdate(cl,cl->modifiedRegion);
UNLOCK(cl->updateBufMutex);
}
}
}
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7 changes: 7 additions & 0 deletions src/libvncserver/rfbserver.c
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Original file line number Diff line number Diff line change
Expand Up @@ -378,6 +378,8 @@ rfbNewTCPOrUDPClient(rfbScreenInfoPtr rfbScreen,
INIT_MUTEX(cl->sendMutex);
INIT_COND(cl->deleteCond);

INIT_MUTEX(cl->updateBufMutex);

cl->state = RFB_PROTOCOL_VERSION;

cl->reverseConnection = FALSE;
Expand Down Expand Up @@ -650,6 +652,11 @@ rfbClientConnectionGone(rfbClientPtr cl)
UNLOCK(cl->sendMutex);
TINI_MUTEX(cl->sendMutex);

/* make sure updateBufMutex is unlocked before destroying */
LOCK(cl->updateBufMutex);
UNLOCK(cl->updateBufMutex);
TINI_MUTEX(cl->updateBufMutex);

#ifdef LIBVNCSERVER_HAVE_LIBPTHREAD
if (cl->screen->backgroundLoop) {
close(cl->pipe_notify_client_thread[0]);
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