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Message-ID: <8b3305d2-ec9c-2fcd-e21c-af11c28ead86@xs4all.nl>
Date: Fri, 19 Mar 2021 10:02:05 +0100
From: Hans Verkuil <hverkuil-cisco@...all.nl>
To: Ricardo Ribalda <ribalda@...omium.org>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
tfiga@...omium.org
Cc: stable@...r.kernel.org
Subject: Re: [PATCH v7 01/17] media: v4l2-ioctl: Fix check_ext_ctrls
On 18/03/2021 21:29, Ricardo Ribalda wrote:
> Drivers that do not use the ctrl-framework use this function instead.
>
> Fix the following issues:
>
> - Do not check for multiple classes when getting the DEF_VAL.
> - Return -EINVAL for request_api calls
> - Default value cannot be changed, return EINVAL as soon as possible.
> - Return the right error_idx
> [If an error is found when validating the list of controls passed with
> VIDIOC_G_EXT_CTRLS, then error_idx shall be set to ctrls->count to
> indicate to userspace that no actual hardware was touched.
> It would have been much nicer of course if error_idx could point to the
> control index that failed the validation, but sadly that's not how the
> API was designed.]
>
> Fixes v4l2-compliance:
> Control ioctls (Input 0):
> warn: v4l2-test-controls.cpp(834): error_idx should be equal to count
> warn: v4l2-test-controls.cpp(855): error_idx should be equal to count
> fail: v4l2-test-controls.cpp(813): doioctl(node, VIDIOC_G_EXT_CTRLS, &ctrls)
> test VIDIOC_G/S/TRY_EXT_CTRLS: FAIL
> Buffer ioctls (Input 0):
> fail: v4l2-test-buffers.cpp(1994): ret != EINVAL && ret != EBADR && ret != ENOTTY
> test Requests: FAIL
>
> Cc: stable@...r.kernel.org
> Fixes: 6fa6f831f095 ("media: v4l2-ctrls: add core request support")
> Suggested-by: Hans Verkuil <hverkuil-cisco@...all.nl>
> Reviewed-by: Hans Verkuil <hverkuil-cisco@...all.nl>
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
> drivers/media/v4l2-core/v4l2-ioctl.c | 59 ++++++++++++++++++----------
> 1 file changed, 38 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 31d1342e61e8..ccd21b4d9c72 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -908,7 +908,7 @@ static void v4l_print_default(const void *arg, bool write_only)
> pr_cont("driver-specific ioctl\n");
> }
>
> -static int check_ext_ctrls(struct v4l2_ext_controls *c, int allow_priv)
> +static bool check_ext_ctrls(struct v4l2_ext_controls *c, unsigned long ioctl)
> {
> __u32 i;
>
> @@ -917,23 +917,40 @@ static int check_ext_ctrls(struct v4l2_ext_controls *c, int allow_priv)
> for (i = 0; i < c->count; i++)
> c->controls[i].reserved2[0] = 0;
>
> - /* V4L2_CID_PRIVATE_BASE cannot be used as control class
> - when using extended controls.
> - Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
> - is it allowed for backwards compatibility.
> - */
> - if (!allow_priv && c->which == V4L2_CID_PRIVATE_BASE)
> - return 0;
> - if (!c->which)
> - return 1;
> + switch (c->which) {
> + case V4L2_CID_PRIVATE_BASE:
> + /*
> + * V4L2_CID_PRIVATE_BASE cannot be used as control class
> + * when using extended controls.
> + * Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
> + * is it allowed for backwards compatibility.
> + */
> + if (ioctl == VIDIOC_G_CTRL || ioctl == VIDIOC_S_CROP)
S_CROP -> S_CTRL :-)
Regards,
Hans
> + 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:
> + c->error_idx = c->count;
> + return false;
> + }
> +
> /* Check that all controls are from the same control class. */
> for (i = 0; i < c->count; i++) {
> if (V4L2_CTRL_ID2WHICH(c->controls[i].id) != c->which) {
> - c->error_idx = i;
> - return 0;
> + c->error_idx = ioctl == VIDIOC_TRY_EXT_CTRLS ? i : c->count;
> + return false;
> }
> }
> - return 1;
> + return true;
> }
>
> static int check_fmt(struct file *file, enum v4l2_buf_type type)
> @@ -2229,7 +2246,7 @@ static int v4l_g_ctrl(const struct v4l2_ioctl_ops *ops,
> ctrls.controls = &ctrl;
> ctrl.id = p->id;
> ctrl.value = p->value;
> - if (check_ext_ctrls(&ctrls, 1)) {
> + if (check_ext_ctrls(&ctrls, VIDIOC_G_CTRL)) {
> int ret = ops->vidioc_g_ext_ctrls(file, fh, &ctrls);
>
> if (ret == 0)
> @@ -2263,7 +2280,7 @@ static int v4l_s_ctrl(const struct v4l2_ioctl_ops *ops,
> ctrls.controls = &ctrl;
> ctrl.id = p->id;
> ctrl.value = p->value;
> - if (check_ext_ctrls(&ctrls, 1))
> + if (check_ext_ctrls(&ctrls, VIDIOC_S_CTRL))
> return ops->vidioc_s_ext_ctrls(file, fh, &ctrls);
> return -EINVAL;
> }
> @@ -2285,8 +2302,8 @@ static int v4l_g_ext_ctrls(const struct v4l2_ioctl_ops *ops,
> vfd, vfd->v4l2_dev->mdev, p);
> if (ops->vidioc_g_ext_ctrls == NULL)
> return -ENOTTY;
> - return check_ext_ctrls(p, 0) ? ops->vidioc_g_ext_ctrls(file, fh, p) :
> - -EINVAL;
> + return check_ext_ctrls(p, VIDIOC_G_EXT_CTRLS) ?
> + ops->vidioc_g_ext_ctrls(file, fh, p) : -EINVAL;
> }
>
> static int v4l_s_ext_ctrls(const struct v4l2_ioctl_ops *ops,
> @@ -2306,8 +2323,8 @@ static int v4l_s_ext_ctrls(const struct v4l2_ioctl_ops *ops,
> vfd, vfd->v4l2_dev->mdev, p);
> if (ops->vidioc_s_ext_ctrls == NULL)
> return -ENOTTY;
> - return check_ext_ctrls(p, 0) ? ops->vidioc_s_ext_ctrls(file, fh, p) :
> - -EINVAL;
> + return check_ext_ctrls(p, VIDIOC_S_EXT_CTRLS) ?
> + ops->vidioc_s_ext_ctrls(file, fh, p) : -EINVAL;
> }
>
> static int v4l_try_ext_ctrls(const struct v4l2_ioctl_ops *ops,
> @@ -2327,8 +2344,8 @@ static int v4l_try_ext_ctrls(const struct v4l2_ioctl_ops *ops,
> vfd, vfd->v4l2_dev->mdev, p);
> if (ops->vidioc_try_ext_ctrls == NULL)
> return -ENOTTY;
> - return check_ext_ctrls(p, 0) ? ops->vidioc_try_ext_ctrls(file, fh, p) :
> - -EINVAL;
> + return check_ext_ctrls(p, VIDIOC_TRY_EXT_CTRLS) ?
> + ops->vidioc_try_ext_ctrls(file, fh, p) : -EINVAL;
> }
>
> /*
>
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