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-rw-r--r--fs/notify/fanotify/fanotify_user.c49
1 files changed, 37 insertions, 12 deletions
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index e16076d386c4..4e1d8ec77b04 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -524,14 +524,18 @@ static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group,
__u32 removed;
int destroy_mark;
+ mutex_lock(&group->mark_mutex);
fsn_mark = fsnotify_find_vfsmount_mark(group, mnt);
- if (!fsn_mark)
+ if (!fsn_mark) {
+ mutex_unlock(&group->mark_mutex);
return -ENOENT;
+ }
removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags,
&destroy_mark);
if (destroy_mark)
- fsnotify_destroy_mark(fsn_mark, group);
+ fsnotify_destroy_mark_locked(fsn_mark, group);
+ mutex_unlock(&group->mark_mutex);
fsnotify_put_mark(fsn_mark);
if (removed & real_mount(mnt)->mnt_fsnotify_mask)
@@ -548,14 +552,19 @@ static int fanotify_remove_inode_mark(struct fsnotify_group *group,
__u32 removed;
int destroy_mark;
+ mutex_lock(&group->mark_mutex);
fsn_mark = fsnotify_find_inode_mark(group, inode);
- if (!fsn_mark)
+ if (!fsn_mark) {
+ mutex_unlock(&group->mark_mutex);
return -ENOENT;
+ }
removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags,
&destroy_mark);
if (destroy_mark)
- fsnotify_destroy_mark(fsn_mark, group);
+ fsnotify_destroy_mark_locked(fsn_mark, group);
+ mutex_unlock(&group->mark_mutex);
+
/* matches the fsnotify_find_inode_mark() */
fsnotify_put_mark(fsn_mark);
if (removed & inode->i_fsnotify_mask)
@@ -599,21 +608,29 @@ static int fanotify_add_vfsmount_mark(struct fsnotify_group *group,
__u32 added;
int ret = 0;
+ mutex_lock(&group->mark_mutex);
fsn_mark = fsnotify_find_vfsmount_mark(group, mnt);
if (!fsn_mark) {
- if (atomic_read(&group->num_marks) > group->fanotify_data.max_marks)
+ if (atomic_read(&group->num_marks) > group->fanotify_data.max_marks) {
+ mutex_unlock(&group->mark_mutex);
return -ENOSPC;
+ }
fsn_mark = kmem_cache_alloc(fanotify_mark_cache, GFP_KERNEL);
- if (!fsn_mark)
+ if (!fsn_mark) {
+ mutex_unlock(&group->mark_mutex);
return -ENOMEM;
+ }
fsnotify_init_mark(fsn_mark, fanotify_free_mark);
- ret = fsnotify_add_mark(fsn_mark, group, NULL, mnt, 0);
- if (ret)
+ ret = fsnotify_add_mark_locked(fsn_mark, group, NULL, mnt, 0);
+ if (ret) {
+ mutex_unlock(&group->mark_mutex);
goto err;
+ }
}
added = fanotify_mark_add_to_mask(fsn_mark, mask, flags);
+ mutex_unlock(&group->mark_mutex);
if (added & ~real_mount(mnt)->mnt_fsnotify_mask)
fsnotify_recalc_vfsmount_mask(mnt);
@@ -642,21 +659,29 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
(atomic_read(&inode->i_writecount) > 0))
return 0;
+ mutex_lock(&group->mark_mutex);
fsn_mark = fsnotify_find_inode_mark(group, inode);
if (!fsn_mark) {
- if (atomic_read(&group->num_marks) > group->fanotify_data.max_marks)
+ if (atomic_read(&group->num_marks) > group->fanotify_data.max_marks) {
+ mutex_unlock(&group->mark_mutex);
return -ENOSPC;
+ }
fsn_mark = kmem_cache_alloc(fanotify_mark_cache, GFP_KERNEL);
- if (!fsn_mark)
+ if (!fsn_mark) {
+ mutex_unlock(&group->mark_mutex);
return -ENOMEM;
+ }
fsnotify_init_mark(fsn_mark, fanotify_free_mark);
- ret = fsnotify_add_mark(fsn_mark, group, inode, NULL, 0);
- if (ret)
+ ret = fsnotify_add_mark_locked(fsn_mark, group, inode, NULL, 0);
+ if (ret) {
+ mutex_unlock(&group->mark_mutex);
goto err;
+ }
}
added = fanotify_mark_add_to_mask(fsn_mark, mask, flags);
+ mutex_unlock(&group->mark_mutex);
if (added & ~inode->i_fsnotify_mask)
fsnotify_recalc_inode_mask(inode);