qtmux: gst_qtmux_check_difference verify before subtract
Avoid negative overflow by checking the order of operands on subtraction of unsigned integers. https://bugzilla.gnome.org/show_bug.cgi?id=635878
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@ -1904,7 +1904,7 @@ static gboolean inline
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gst_qtmux_check_difference (GstQTMux * qtmux, GstClockTime a,
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GstClockTime b, GstClockTime magn)
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{
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return ((a - b >= (magn >> 1)) || (b - a >= (magn >> 1)));
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return ((a >= b) ? (a - b >= (magn >> 1)) : (b - a >= (magn >> 1)));
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}
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/*
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