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ecryptfs: close rmmod race

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-03-28 13:30:23 -04:00
parent de55eb1d60
commit 52f21999c7
1 changed files with 2 additions and 12 deletions
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14
fs/ecryptfs/miscdev.c
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@ -80,13 +80,6 @@ ecryptfs_miscdev_open(struct inode *inode, struct file *file)
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
rc = try_module_get(THIS_MODULE);
if (rc == 0) {
rc = -EIO;
printk(KERN_ERR "%s: Error attempting to increment module use "
"count; rc = [%d]\n", __func__, rc);
goto out_unlock_daemon_list;
}
rc = ecryptfs_find_daemon_by_euid(&daemon);
if (!rc) {
rc = -EINVAL;
@ -96,7 +89,7 @@ ecryptfs_miscdev_open(struct inode *inode, struct file *file)
if (rc) {
printk(KERN_ERR "%s: Error attempting to spawn daemon; "
"rc = [%d]\n", __func__, rc);
goto out_module_put_unlock_daemon_list;
goto out_unlock_daemon_list;
}
mutex_lock(&daemon->mux);
if (daemon->flags & ECRYPTFS_DAEMON_MISCDEV_OPEN) {
@ -108,9 +101,6 @@ ecryptfs_miscdev_open(struct inode *inode, struct file *file)
atomic_inc(&ecryptfs_num_miscdev_opens);
out_unlock_daemon:
mutex_unlock(&daemon->mux);
out_module_put_unlock_daemon_list:
if (rc)
module_put(THIS_MODULE);
out_unlock_daemon_list:
mutex_unlock(&ecryptfs_daemon_hash_mux);
return rc;
@ -147,7 +137,6 @@ ecryptfs_miscdev_release(struct inode *inode, struct file *file)
"bug.\n", __func__, rc);
BUG();
}
module_put(THIS_MODULE);
return rc;
}
@ -471,6 +460,7 @@ out_free:
static const struct file_operations ecryptfs_miscdev_fops = {
.owner = THIS_MODULE,
.open = ecryptfs_miscdev_open,
.poll = ecryptfs_miscdev_poll,
.read = ecryptfs_miscdev_read,