From: YoungJun Cho <yj44....@samsung.com>
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....@samsung.com>
Signed-off-by: Seung-Woo Kim <sw0312....@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
---
change from v3
- fix typo
change from v2
- adds put_pid, drm_gem_release, drm_prime_destroy_file_private as Chris's
review
change from v1
- replaces error value for failure to find the minor as ENODEV as Chris
commented
drivers/gpu/drm/drm_fops.c | 25 ++++++++++++++++++++-----
1 file changed, 20 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index 429e07d..33b1125 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -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;
--
1.7.9.5
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