07da61a6cc
1) It is not useful to call "devfs_clear_cdevpriv()" from "d_close" callbacks, hence for example read, write, ioctl and so on might be sleeping at the time of "d_close" being called and then then freed private data can still be accessed. Examples: dtrace, linux_compat, ksyms (all fixed by this patch) 2) In sys/dev/drm* there are some cases in which memory will be freed twice, if open fails, first by code in the open routine, secondly by the cdevpriv destructor. Move registration of the cdevpriv to the end of the drm open routines. 3) devfs_clear_cdevpriv() is not called if the "d_open" callback registered cdevpriv data and the "d_open" callback function returned an error. Fix this. Discussed with: phk MFC after: 2 weeks
106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
/*-
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Rickard E. (Rik) Faith <faith@valinux.com>
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* Daryll Strauss <daryll@valinux.com>
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* Gareth Hughes <gareth@valinux.com>
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/** @file drm_fops.c
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* Support code for dealing with the file privates associated with each
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* open of the DRM device.
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*/
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#include "dev/drm/drmP.h"
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/* drm_open_helper is called whenever a process opens /dev/drm. */
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int drm_open_helper(struct cdev *kdev, int flags, int fmt, DRM_STRUCTPROC *p,
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struct drm_device *dev)
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{
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struct drm_file *priv;
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int retcode;
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if (flags & O_EXCL)
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return EBUSY; /* No exclusive opens */
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dev->flags = flags;
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DRM_DEBUG("pid = %d, device = %s\n", DRM_CURRENTPID, devtoname(kdev));
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priv = malloc(sizeof(*priv), DRM_MEM_FILES, M_NOWAIT | M_ZERO);
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if (priv == NULL) {
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return ENOMEM;
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}
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DRM_LOCK();
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priv->dev = dev;
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priv->uid = p->td_ucred->cr_svuid;
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priv->pid = p->td_proc->p_pid;
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priv->ioctl_count = 0;
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/* for compatibility root is always authenticated */
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priv->authenticated = DRM_SUSER(p);
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if (dev->driver->open) {
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/* shared code returns -errno */
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retcode = -dev->driver->open(dev, priv);
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if (retcode != 0) {
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free(priv, DRM_MEM_FILES);
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DRM_UNLOCK();
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return retcode;
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}
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}
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/* first opener automatically becomes master */
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priv->master = TAILQ_EMPTY(&dev->files);
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TAILQ_INSERT_TAIL(&dev->files, priv, link);
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DRM_UNLOCK();
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kdev->si_drv1 = dev;
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retcode = devfs_set_cdevpriv(priv, drm_close);
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if (retcode != 0)
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drm_close(priv);
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return (retcode);
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}
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/* The drm_read and drm_poll are stubs to prevent spurious errors
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* on older X Servers (4.3.0 and earlier) */
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int drm_read(struct cdev *kdev, struct uio *uio, int ioflag)
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{
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return 0;
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}
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int drm_poll(struct cdev *kdev, int events, DRM_STRUCTPROC *p)
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{
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return 0;
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}
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