[PATCH RFC] media: mediatek: vcodec: avoid accessing a failed control

[Slavin Liu]

Set the volatile flag only if the control was created. The existing
handler error path remains responsible for reporting allocation errors.

Detected by static analysis and reviewed with AI-assisted source auditing.

Fixes: 590577a4e525 ("[media] vcodec: mediatek: Add Mediatek V4L2 Video Decoder Driver")
Assisted-by: LLM
Signed-off-by: Slavin Liu <bolin.liu at seu.edu.cn>
---
 .../platform/mediatek/vcodec/decoder/mtk_vcodec_dec_stateful.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_stateful.c b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_stateful.c
index aa9bdee7a96c..8441f1d69d2f 100644
--- a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_stateful.c
+++ b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_stateful.c
@@ -555,7 +555,8 @@ static int mtk_vcodec_dec_ctrls_setup(struct mtk_vcodec_dec_ctx *ctx)
 
 	ctrl = v4l2_ctrl_new_std(&ctx->ctrl_hdl, &mtk_vcodec_dec_ctrl_ops,
 				 V4L2_CID_MIN_BUFFERS_FOR_CAPTURE, 0, 32, 1, 1);
-	ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
+	if (ctrl)
+		ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
 	v4l2_ctrl_new_std_menu(&ctx->ctrl_hdl, &mtk_vcodec_dec_ctrl_ops,
 			       V4L2_CID_MPEG_VIDEO_VP9_PROFILE,
 			       V4L2_MPEG_VIDEO_VP9_PROFILE_0, 0,