[v4] media: venus: fix use after free in vdec_close

Message ID 1715231669-16795-1-git-send-email-quic_dikshita@quicinc.com (mailing list archive)
State New
Delegated to: Stanimir Varbanov
Headers
Series [v4] media: venus: fix use after free in vdec_close |

Commit Message

Dikshita Agarwal May 9, 2024, 5:14 a.m. UTC
  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: af2c3834c8ca ("[media] media: venus: adding core part and helper functions")
Signed-off-by: Dikshita Agarwal <quic_dikshita@quicinc.com>
---
Changes since v3:
- Fixed style issue with fixes tag 

Changes since v2:
- Fixed email id

Changes since v1:
- Added fixes and stable tags

 drivers/media/platform/qcom/venus/vdec.c | 1 +
 1 file changed, 1 insertion(+)
  

Patch

diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c
index 29130a9..56f8a25 100644
--- a/drivers/media/platform/qcom/venus/vdec.c
+++ b/drivers/media/platform/qcom/venus/vdec.c
@@ -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);