Hello,
Is there any follow-up about this issue?
Thanks,
Zheng
AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
于2023年7月20日周四 15:45写道：
>
> Il 07/07/23 11:24, Zheng Wang ha scritto:
> > In mtk_jpeg_probe, &jpeg->job_timeout_work is bound with
> > mtk_jpeg_job_timeout_work. Then mtk_jpeg_dec_device_run
> > and mtk_jpeg_enc_device_run may be called to start the
> > work.
> > If we remove the module which will call mtk_jpeg_remove
> > to make cleanup, there may be a unfinished work. The
> > possible sequence is as follows, which will cause a
> > typical UAF bug.
> >
> > Fix it by canceling the work before cleanup in the mtk_jpeg_remove
> >
> > CPU0 CPU1
> >
> > |mtk_jpeg_job_timeout_work
> > mtk_jpeg_remove |
> > v4l2_m2m_release |
> > kfree(m2m_dev); |
> > |
> > | v4l2_m2m_get_curr_priv
> > | m2m_dev->curr_ctx //use
> > Fixes: b2f0d2724ba4 ("[media] vcodec: mediatek: Add Mediatek JPEG Decoder Driver")
> > Signed-off-by: Zheng Wang <zyytlz.wz@xxxxxxx>
>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
>
>
