8003444: Fix potential NULL pointer dereference

Reviewed-by: jgodinez, prr

src/share/native/sun/java2d/cmm/lcms/cmscgats.c

@@ -634,6 +634,8 @@ cmsFloat64Number ParseFloatNumber(const char *Buffer)
     cmsFloat64Number dnum = 0.0;
     int sign = 1;
 
+    if (Buffer == NULL) return 0.0;
+
     if (*Buffer == '-' || *Buffer == '+') {
 
          sign = (*Buffer == '-') ? -1 : 1;

src/share/native/sun/java2d/cmm/lcms/cmslut.c

@@ -1021,6 +1021,8 @@ cmsStage* _cmsStageAllocLabV2ToV4curves(cmsContext ContextID)
     mpe = cmsStageAllocToneCurves(ContextID, 3, LabTable);
     cmsFreeToneCurveTriple(LabTable);
 
+    if (mpe == NULL) return NULL;
+
     mpe ->Implements = cmsSigLabV2toV4;
     return mpe;
 }