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media: venus: fix use after free in vdec_close

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There appears to be a possible use after free with vdec_close().
The firmware will add buffer release work to the work queue through
HFI callbacks as a normal part of decoding. Randomly closing the
decoder device from userspace during normal decoding can incur
a read after free for inst.

Fix it by cancelling the work in vdec_close.

Cc: stable@vger.kernel.org
Fixes: af2c3834c8 ("[media] media: venus: adding core part and helper functions")
Signed-off-by: Dikshita Agarwal <quic_dikshita@quicinc.com>
Acked-by: Vikash Garodia <quic_vgarodia@quicinc.com>
Signed-off-by: Stanimir Varbanov <stanimir.k.varbanov@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
This commit is contained in:
Dikshita Agarwal
2024-05-09 10:44:29 +05:30
committed by Hans Verkuil
parent 193b3dac29
commit a0157b5aa3
1 changed files with 1 additions and 0 deletions
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1
drivers/media/platform/qcom/venus/vdec.c
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@@ -1747,6 +1747,7 @@ static int vdec_close(struct file *file)
vdec_pm_get(inst);
cancel_work_sync(&inst->delayed_process_work);
v4l2_m2m_ctx_release(inst->m2m_ctx);
v4l2_m2m_release(inst->m2m_dev);
vdec_ctrl_deinit(inst);