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Have to set windowid to a valid value first, since that check appears earlier in the code than the masks/length check. Also have to have data[] set large enough so that reading mask data for 0xFFFF masks doesn't overflow past the end of the array into uninitialized data. Signed-off-by: Alan Coopersmith <alan.coopersmith@sun.com> Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>