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[media] uvcvideo: Fix uvc_query_v4l2_ctrl() and uvc_xu_ctrl_query() locking

Browse Source 
Take the ctrl_mutex mutex before touching control information in those
functions.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Laurent Pinchart 2010-10-02 09:04:53 -03:00 committed by Mauro Carvalho Chehab
parent b5977a58c3
commit 27a61c13ec
2 changed files with 42 additions and 29 deletions
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69
drivers/media/video/uvc/uvc_ctrl.c
View File

@ -863,9 +863,15 @@ int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
unsigned int i;
int ret;
ret = mutex_lock_interruptible(&chain->ctrl_mutex);
if (ret < 0)
return -ERESTARTSYS;
ctrl = uvc_find_control(chain, v4l2_ctrl->id, &mapping);
if (ctrl == NULL)
return -EINVAL;
if (ctrl == NULL) {
ret = -EINVAL;
goto done;
}
memset(v4l2_ctrl, 0, sizeof *v4l2_ctrl);
v4l2_ctrl->id = mapping->id;
@ -881,7 +887,7 @@ int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
if (!ctrl->cached) {
ret = uvc_ctrl_populate_cache(chain, ctrl);
if (ret < 0)
return ret;
goto done;
}
if (ctrl->info.flags & UVC_CONTROL_GET_DEF) {
@ -903,19 +909,19 @@ int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
}
}
return 0;
goto done;
case V4L2_CTRL_TYPE_BOOLEAN:
v4l2_ctrl->minimum = 0;
v4l2_ctrl->maximum = 1;
v4l2_ctrl->step = 1;
return 0;
goto done;
case V4L2_CTRL_TYPE_BUTTON:
v4l2_ctrl->minimum = 0;
v4l2_ctrl->maximum = 0;
v4l2_ctrl->step = 0;
return 0;
goto done;
default:
break;
@ -933,7 +939,9 @@ int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
v4l2_ctrl->step = mapping->get(mapping, UVC_GET_RES,
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
return 0;
done:
mutex_unlock(&chain->ctrl_mutex);
return ret;
}
@ -1295,6 +1303,7 @@ int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
struct uvc_entity *entity;
struct uvc_control *ctrl = NULL;
unsigned int i, found = 0;
int restore = 0;
__u8 *data;
int ret;
@ -1326,44 +1335,48 @@ int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
return -EINVAL;
}
ret = uvc_ctrl_init_xu_ctrl(chain->dev, ctrl);
if (ret < 0)
return -ENOENT;
/* Validate control data size. */
if (ctrl->info.size != xctrl->size)
return -EINVAL;
if ((set && !(ctrl->info.flags & UVC_CONTROL_SET_CUR)) ||
(!set && !(ctrl->info.flags & UVC_CONTROL_GET_CUR)))
return -EINVAL;
if (mutex_lock_interruptible(&chain->ctrl_mutex))
return -ERESTARTSYS;
ret = uvc_ctrl_init_xu_ctrl(chain->dev, ctrl);
if (ret < 0) {
ret = -ENOENT;
goto done;
}
/* Validate control data size. */
if (ctrl->info.size != xctrl->size) {
ret = -EINVAL;
goto done;
}
if ((set && !(ctrl->info.flags & UVC_CONTROL_SET_CUR)) ||
(!set && !(ctrl->info.flags & UVC_CONTROL_GET_CUR))) {
ret = -EINVAL;
goto done;
}
memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
xctrl->size);
ctrl->info.size);
data = uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT);
restore = set;
if (set && copy_from_user(data, xctrl->data, xctrl->size)) {
ret = -EFAULT;
goto out;
goto done;
}
ret = uvc_query_ctrl(chain->dev, set ? UVC_SET_CUR : UVC_GET_CUR,
xctrl->unit, chain->dev->intfnum, xctrl->selector,
data, xctrl->size);
if (ret < 0)
goto out;
goto done;
if (!set && copy_to_user(xctrl->data, data, xctrl->size)) {
if (!set && copy_to_user(xctrl->data, data, xctrl->size))
ret = -EFAULT;
goto out;
}
out:
if (ret)
done:
if (ret && restore)
memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
xctrl->size);

2
drivers/media/video/uvc/uvcvideo.h
View File

@ -413,7 +413,7 @@ struct uvc_video_chain {
struct uvc_entity *processing; /* Processing unit */
struct uvc_entity *selector; /* Selector unit */
struct mutex ctrl_mutex;
struct mutex ctrl_mutex; /* Protects ctrl.info */
};
struct uvc_streaming {