From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from www.linuxtv.org ([130.149.80.248]:42750 "EHLO www.linuxtv.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751822AbeA3MnQ (ORCPT ); Tue, 30 Jan 2018 07:43:16 -0500 From: Mauro Carvalho Chehab Date: Tue, 30 Jan 2018 12:31:33 +0000 Subject: [git:media_tree/master] media: v4l2-compat-ioctl32.c: fix ctrl_is_pointer To: linuxtv-commits@linuxtv.org Cc: Sakari Ailus , stable@vger.kernel.org, Hans Verkuil Reply-to: linux-media@vger.kernel.org Message-Id: Sender: stable-owner@vger.kernel.org List-ID: This is an automatic generated email to let you know that the following patch were queued: Subject: media: v4l2-compat-ioctl32.c: fix ctrl_is_pointer Author: Hans Verkuil Date: Wed Jan 24 05:30:59 2018 -0500 ctrl_is_pointer just hardcoded two known string controls, but that caused problems when using e.g. custom controls that use a pointer for the payload. Reimplement this function: it now finds the v4l2_ctrl (if the driver uses the control framework) or it calls vidioc_query_ext_ctrl (if the driver implements that directly). In both cases it can now check if the control is a pointer control or not. Signed-off-by: Hans Verkuil Acked-by: Sakari Ailus Cc: # for v4.15 and up Signed-off-by: Mauro Carvalho Chehab drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 57 ++++++++++++++++++--------- 1 file changed, 38 insertions(+), 19 deletions(-) --- diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c index 7dff9b4aeb19..30c5be1f0549 100644 --- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c @@ -18,6 +18,8 @@ #include #include #include +#include +#include #include static long native_ioctl(struct file *file, unsigned int cmd, unsigned long arg) @@ -601,24 +603,39 @@ struct v4l2_ext_control32 { }; } __attribute__ ((packed)); -/* The following function really belong in v4l2-common, but that causes - a circular dependency between modules. We need to think about this, but - for now this will do. */ - -/* Return non-zero if this control is a pointer type. Currently only - type STRING is a pointer type. */ -static inline int ctrl_is_pointer(u32 id) +/* Return true if this control is a pointer type. */ +static inline bool ctrl_is_pointer(struct file *file, u32 id) { - switch (id) { - case V4L2_CID_RDS_TX_PS_NAME: - case V4L2_CID_RDS_TX_RADIO_TEXT: - return 1; - default: - return 0; + struct video_device *vdev = video_devdata(file); + struct v4l2_fh *fh = NULL; + struct v4l2_ctrl_handler *hdl = NULL; + struct v4l2_query_ext_ctrl qec = { id }; + const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops; + + if (test_bit(V4L2_FL_USES_V4L2_FH, &vdev->flags)) + fh = file->private_data; + + if (fh && fh->ctrl_handler) + hdl = fh->ctrl_handler; + else if (vdev->ctrl_handler) + hdl = vdev->ctrl_handler; + + if (hdl) { + struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, id); + + return ctrl && ctrl->is_ptr; } + + if (!ops->vidioc_query_ext_ctrl) + return false; + + return !ops->vidioc_query_ext_ctrl(file, fh, &qec) && + (qec.flags & V4L2_CTRL_FLAG_HAS_PAYLOAD); } -static int get_v4l2_ext_controls32(struct v4l2_ext_controls *kp, struct v4l2_ext_controls32 __user *up) +static int get_v4l2_ext_controls32(struct file *file, + struct v4l2_ext_controls *kp, + struct v4l2_ext_controls32 __user *up) { struct v4l2_ext_control32 __user *ucontrols; struct v4l2_ext_control __user *kcontrols; @@ -651,7 +668,7 @@ static int get_v4l2_ext_controls32(struct v4l2_ext_controls *kp, struct v4l2_ext return -EFAULT; if (get_user(id, &kcontrols->id)) return -EFAULT; - if (ctrl_is_pointer(id)) { + if (ctrl_is_pointer(file, id)) { void __user *s; if (get_user(p, &ucontrols->string)) @@ -666,7 +683,9 @@ static int get_v4l2_ext_controls32(struct v4l2_ext_controls *kp, struct v4l2_ext return 0; } -static int put_v4l2_ext_controls32(struct v4l2_ext_controls *kp, struct v4l2_ext_controls32 __user *up) +static int put_v4l2_ext_controls32(struct file *file, + struct v4l2_ext_controls *kp, + struct v4l2_ext_controls32 __user *up) { struct v4l2_ext_control32 __user *ucontrols; struct v4l2_ext_control __user *kcontrols = @@ -698,7 +717,7 @@ static int put_v4l2_ext_controls32(struct v4l2_ext_controls *kp, struct v4l2_ext /* Do not modify the pointer when copying a pointer control. The contents of the pointer was changed, not the pointer itself. */ - if (ctrl_is_pointer(id)) + if (ctrl_is_pointer(file, id)) size -= sizeof(ucontrols->value64); if (copy_in_user(ucontrols, kcontrols, size)) return -EFAULT; @@ -912,7 +931,7 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar case VIDIOC_G_EXT_CTRLS: case VIDIOC_S_EXT_CTRLS: case VIDIOC_TRY_EXT_CTRLS: - err = get_v4l2_ext_controls32(&karg.v2ecs, up); + err = get_v4l2_ext_controls32(file, &karg.v2ecs, up); compatible_arg = 0; break; case VIDIOC_DQEVENT: @@ -939,7 +958,7 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar case VIDIOC_G_EXT_CTRLS: case VIDIOC_S_EXT_CTRLS: case VIDIOC_TRY_EXT_CTRLS: - if (put_v4l2_ext_controls32(&karg.v2ecs, up)) + if (put_v4l2_ext_controls32(file, &karg.v2ecs, up)) err = -EFAULT; break; case VIDIOC_S_EDID: