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In order to avoid error pointers from frame_vector_pages(), we could use IS_ERR() to check the return value to fix this. This checking operation could make sure that vector contains pages. Signed-off-by: Ma Ke <make_ruc2021@163.com> Acked-by: Tomasz Figa <tfiga@chromium.org> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>