[v2] media: venus: fix use after free in vdec_close

Message ID 1714974110-19175-1-git-send-email-dikshita@qti.qualcomm.com (mailing list archive)
State New
Delegated to: Stanimir Varbanov
Series [v2] media: venus: fix use after free in vdec_close |

Commit Message

Agarwal, Dikshita May 6, 2024, 5:41 a.m. UTC
  From: Dikshita Agarwal <quic_dikshita@quicinc.com>

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: af2c3834c ("media: venus: adding core part and helper functions")
Signed-off-by: Dikshita Agarwal <quic_dikshita@quicinc.com>
Changes since v1:
- Added fixes and stable tags

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


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)
+	cancel_work_sync(&inst->delayed_process_work);