linux-kernel - [PATCH v7 2/5] media: venus: venc: Clamp parm smaller than 1fps and bigger than 240

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Message-Id: <20250616-test-v7-2-b8c0f98494fa@chromium.org>
Date: Mon, 16 Jun 2025 15:29:15 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Vikash Garodia <quic_vgarodia@...cinc.com>, 
 Dikshita Agarwal <quic_dikshita@...cinc.com>, 
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Stanimir Varbanov <stanimir.varbanov@...aro.org>, 
 Hans Verkuil <hans.verkuil@...co.com>
Cc: linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Ricardo Ribalda <ribalda@...omium.org>, 
 Hans Verkuil <hverkuil@...all.nl>
Subject: [PATCH v7 2/5] media: venus: venc: Clamp parm smaller than 1fps
 and bigger than 240

The driver uses "whole" fps in all its calculations (e.g. in
load_per_instance()). Those calculation expect an fps bigger than 1, and
not big enough to overflow.

Clamp the parm if the user provides a value that will result in an invalid
fps.

Reported-by: Hans Verkuil <hverkuil@...all.nl>
Closes: https://lore.kernel.org/linux-media/f11653a7-bc49-48cd-9cdb-1659147453e4@xs4all.nl/T/#m91cd962ac942834654f94c92206e2f85ff7d97f0
Fixes: aaaa93eda64b ("[media] media: venus: venc: add video encoder files")
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/platform/qcom/venus/venc.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/venc.c b/drivers/media/platform/qcom/venus/venc.c
index c7f8e37dba9b2218c0988dbfad1f7c04e055bbb0..b9ccee870c3d1238e04cef5e9344bd992d86d737 100644
--- a/drivers/media/platform/qcom/venus/venc.c
+++ b/drivers/media/platform/qcom/venus/venc.c
@@ -411,11 +411,10 @@ static int venc_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
 	us_per_frame = timeperframe->numerator * (u64)USEC_PER_SEC;
 	do_div(us_per_frame, timeperframe->denominator);
 
-	if (!us_per_frame)
-		return -EINVAL;
-
+	us_per_frame = clamp(us_per_frame, 1, USEC_PER_SEC);
 	fps = (u64)USEC_PER_SEC;
 	do_div(fps, us_per_frame);
+	fps = min(VENUS_MAX_FPS, fps);
 
 	inst->timeperframe = *timeperframe;
 	inst->fps = fps;

-- 
2.50.0.rc1.591.g9c95f17f64-goog