linux-kernel - [PATCH v6 04/17] media: v4l2-ioctl: check_ext_ctrls: Fix V4L2_CTRL_WHICH_DEF

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Message-Id: <20210317164511.39967-5-ribalda@chromium.org>
Date:   Wed, 17 Mar 2021 17:44:58 +0100
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        tfiga@...omium.org
Cc:     Ricardo Ribalda <ribalda@...omium.org>, stable@...r.kernel.org
Subject: [PATCH v6 04/17] media: v4l2-ioctl: check_ext_ctrls: Fix V4L2_CTRL_WHICH_DEF_VAL

Drivers that do not use the ctrl-framework use this function instead.

Default value cannot be changed, return EINVAL as soon as possible.

Cc: stable@...r.kernel.org
Fixes: 6fa6f831f095 ("media: v4l2-ctrls: add core request support")
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/v4l2-core/v4l2-ioctl.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 528eb5f420f6..ccd21b4d9c72 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -929,6 +929,13 @@ static bool check_ext_ctrls(struct v4l2_ext_controls *c, unsigned long ioctl)
 			return false;
 		break;
 	case V4L2_CTRL_WHICH_DEF_VAL:
+		/* Default value cannot be changed */
+		if (ioctl == VIDIOC_S_EXT_CTRLS ||
+		    ioctl == VIDIOC_TRY_EXT_CTRLS) {
+			c->error_idx = c->count;
+			return false;
+		}
+		return true;
 	case V4L2_CTRL_WHICH_CUR_VAL:
 		return true;
 	case V4L2_CTRL_WHICH_REQUEST_VAL:
-- 
2.31.0.rc2.261.g7f71774620-goog