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-rw-r--r--fs/notify/inotify/inotify_user.c39
1 files changed, 13 insertions, 26 deletions
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index bd46e7c..8445fbc 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -290,7 +290,6 @@ static int inotify_fasync(int fd, struct file *file, int on)
static int inotify_release(struct inode *ignored, struct file *file)
{
struct fsnotify_group *group = file->private_data;
- struct user_struct *user = group->inotify_data.user;
pr_debug("%s: group=%p\n", __func__, group);
@@ -299,8 +298,6 @@ static int inotify_release(struct inode *ignored, struct file *file)
/* free this group, matching get was inotify_init->fsnotify_obtain_group */
fsnotify_put_group(group);
- atomic_dec(&user->inotify_devs);
-
return 0;
}
@@ -697,7 +694,7 @@ retry:
return ret;
}
-static struct fsnotify_group *inotify_new_group(struct user_struct *user, unsigned int max_events)
+static struct fsnotify_group *inotify_new_group(unsigned int max_events)
{
struct fsnotify_group *group;
@@ -710,8 +707,14 @@ static struct fsnotify_group *inotify_new_group(struct user_struct *user, unsign
spin_lock_init(&group->inotify_data.idr_lock);
idr_init(&group->inotify_data.idr);
group->inotify_data.last_wd = 0;
- group->inotify_data.user = user;
group->inotify_data.fa = NULL;
+ group->inotify_data.user = get_current_user();
+
+ if (atomic_inc_return(&group->inotify_data.user->inotify_devs) >
+ inotify_max_user_instances) {
+ fsnotify_put_group(group);
+ return ERR_PTR(-EMFILE);
+ }
return group;
}
@@ -721,7 +724,6 @@ static struct fsnotify_group *inotify_new_group(struct user_struct *user, unsign
SYSCALL_DEFINE1(inotify_init1, int, flags)
{
struct fsnotify_group *group;
- struct user_struct *user;
int ret;
/* Check the IN_* constants for consistency. */
@@ -731,31 +733,16 @@ SYSCALL_DEFINE1(inotify_init1, int, flags)
if (flags & ~(IN_CLOEXEC | IN_NONBLOCK))
return -EINVAL;
- user = get_current_user();
- if (unlikely(atomic_read(&user->inotify_devs) >=
- inotify_max_user_instances)) {
- ret = -EMFILE;
- goto out_free_uid;
- }
-
/* fsnotify_obtain_group took a reference to group, we put this when we kill the file in the end */
- group = inotify_new_group(user, inotify_max_queued_events);
- if (IS_ERR(group)) {
- ret = PTR_ERR(group);
- goto out_free_uid;
- }
-
- atomic_inc(&user->inotify_devs);
+ group = inotify_new_group(inotify_max_queued_events);
+ if (IS_ERR(group))
+ return PTR_ERR(group);
ret = anon_inode_getfd("inotify", &inotify_fops, group,
O_RDONLY | flags);
- if (ret >= 0)
- return ret;
+ if (ret < 0)
+ fsnotify_put_group(group);
- fsnotify_put_group(group);
- atomic_dec(&user->inotify_devs);
-out_free_uid:
- free_uid(user);
return ret;
}
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