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drm: fix error routines in drm_open_helper

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There are missing parts to handle error in drm_open_helper().
The priv->minor, assigned by idr_find() which can return NULL,
should be checked whether it is NULL or not before referencing it.
put_pid(), drm_gem_release(), and drm_prime_destory_file_private()
should be called when error happens after their pair functions are
called. If an error occurs after executing dev->driver->open()
which allocates driver specific per-file private data, then the
private data should be released.

Signed-off-by: YoungJun Cho <yj44.cho@samsung.com>
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Chris Wilson <chris-wilson.co.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Seung-Woo Kim 2013-07-02 09:53:28 +09:00 committed by Dave Airlie
parent fe2ef78066
commit df9b6a9c33
1 changed files with 20 additions and 5 deletions
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25
drivers/gpu/drm/drm_fops.c
View file

@ -271,6 +271,11 @@ static int drm_open_helper(struct inode *inode, struct file *filp,
priv->uid = current_euid();
priv->pid = get_pid(task_pid(current));
priv->minor = idr_find(&drm_minors_idr, minor_id);
if (!priv->minor) {
ret = -ENODEV;
goto out_put_pid;
}
priv->ioctl_count = 0;
/* for compatibility root is always authenticated */
priv->authenticated = capable(CAP_SYS_ADMIN);
@ -292,7 +297,7 @@ static int drm_open_helper(struct inode *inode, struct file *filp,
if (dev->driver->open) {
ret = dev->driver->open(dev, priv);
if (ret < 0)
goto out_free;
goto out_prime_destroy;
}
@ -304,7 +309,7 @@ static int drm_open_helper(struct inode *inode, struct file *filp,
if (!priv->minor->master) {
mutex_unlock(&dev->struct_mutex);
ret = -ENOMEM;
goto out_free;
goto out_close;
}
priv->is_master = 1;
@ -322,7 +327,7 @@ static int drm_open_helper(struct inode *inode, struct file *filp,
drm_master_put(&priv->minor->master);
drm_master_put(&priv->master);
mutex_unlock(&dev->struct_mutex);
goto out_free;
goto out_close;
}
}
mutex_lock(&dev->struct_mutex);
@ -333,7 +338,7 @@ static int drm_open_helper(struct inode *inode, struct file *filp,
drm_master_put(&priv->minor->master);
drm_master_put(&priv->master);
mutex_unlock(&dev->struct_mutex);
goto out_free;
goto out_close;
}
}
mutex_unlock(&dev->struct_mutex);
@ -367,7 +372,17 @@ static int drm_open_helper(struct inode *inode, struct file *filp,
#endif
return 0;
out_free:
out_close:
if (dev->driver->postclose)
dev->driver->postclose(dev, priv);
out_prime_destroy:
if (drm_core_check_feature(dev, DRIVER_PRIME))
drm_prime_destroy_file_private(&priv->prime);
if (dev->driver->driver_features & DRIVER_GEM)
drm_gem_release(dev, priv);
out_put_pid:
put_pid(priv->pid);
kfree(priv);
filp->private_data = NULL;
return ret;