linux-kernel - [RFCv2 09/17] v4l2-ctrls: use ref in helper instead of ctrl

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20180131102427.207721-10-acourbot@chromium.org>
Date:   Wed, 31 Jan 2018 19:24:27 +0900
From:   Alexandre Courbot <acourbot@...omium.org>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Pawel Osciak <posciak@...omium.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Gustavo Padovan <gustavo.padovan@...labora.com>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hans Verkuil <hans.verkuil@...co.com>,
        Alexandre Courbot <acourbot@...omium.org>
Subject: [RFCv2 09/17] v4l2-ctrls: use ref in helper instead of ctrl

From: Hans Verkuil <hans.verkuil@...co.com>

The next patch needs the reference to a control instead of the
control itself, so change struct v4l2_ctrl_helper accordingly.

Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
Signed-off-by: Alexandre Courbot <acourbot@...omium.org>
---
 drivers/media/v4l2-core/v4l2-ctrls.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index ca4c320f64c9..0fa20c89ece1 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -37,8 +37,8 @@
 struct v4l2_ctrl_helper {
 	/* Pointer to the control reference of the master control */
 	struct v4l2_ctrl_ref *mref;
-	/* The control corresponding to the v4l2_ext_control ID field. */
-	struct v4l2_ctrl *ctrl;
+	/* The control ref corresponding to the v4l2_ext_control ID field. */
+	struct v4l2_ctrl_ref *ref;
 	/* v4l2_ext_control index of the next control belonging to the
 	   same cluster, or 0 if there isn't any. */
 	u32 next;
@@ -2852,6 +2852,7 @@ static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
 		ref = find_ref_lock(hdl, id);
 		if (ref == NULL)
 			return -EINVAL;
+		h->ref = ref;
 		ctrl = ref->ctrl;
 		if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
 			return -EINVAL;
@@ -2874,7 +2875,6 @@ static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
 		}
 		/* Store the ref to the master control of the cluster */
 		h->mref = ref;
-		h->ctrl = ctrl;
 		/* Initially set next to 0, meaning that there is no other
 		   control in this helper array belonging to the same
 		   cluster */
@@ -2959,7 +2959,7 @@ int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs
 	cs->error_idx = cs->count;
 
 	for (i = 0; !ret && i < cs->count; i++)
-		if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
+		if (helpers[i].ref->ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
 			ret = -EACCES;
 
 	for (i = 0; !ret && i < cs->count; i++) {
@@ -2994,7 +2994,7 @@ int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs
 
 			do {
 				ret = ctrl_to_user(cs->controls + idx,
-						   helpers[idx].ctrl);
+						   helpers[idx].ref->ctrl);
 				idx = helpers[idx].next;
 			} while (!ret && idx);
 		}
@@ -3133,7 +3133,7 @@ static int validate_ctrls(struct v4l2_ext_controls *cs,
 
 	cs->error_idx = cs->count;
 	for (i = 0; i < cs->count; i++) {
-		struct v4l2_ctrl *ctrl = helpers[i].ctrl;
+		struct v4l2_ctrl *ctrl = helpers[i].ref->ctrl;
 		union v4l2_ctrl_ptr p_new;
 
 		cs->error_idx = i;
@@ -3245,7 +3245,7 @@ static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
 			do {
 				/* Check if the auto control is part of the
 				   list, and remember the new value. */
-				if (helpers[tmp_idx].ctrl == master)
+				if (helpers[tmp_idx].ref->ctrl == master)
 					new_auto_val = cs->controls[tmp_idx].value;
 				tmp_idx = helpers[tmp_idx].next;
 			} while (tmp_idx);
@@ -3258,7 +3258,7 @@ static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
 		/* Copy the new caller-supplied control values.
 		   user_to_new() sets 'is_new' to 1. */
 		do {
-			struct v4l2_ctrl *ctrl = helpers[idx].ctrl;
+			struct v4l2_ctrl *ctrl = helpers[idx].ref->ctrl;
 
 			ret = user_to_new(cs->controls + idx, ctrl);
 			if (!ret && ctrl->is_ptr)
@@ -3274,7 +3274,7 @@ static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
 			idx = i;
 			do {
 				ret = new_to_user(cs->controls + idx,
-						helpers[idx].ctrl);
+						helpers[idx].ref->ctrl);
 				idx = helpers[idx].next;
 			} while (!ret && idx);
 		}
-- 
2.16.0.rc1.238.g530d649a79-goog