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audit: clean up refcounting in audit-tree 

Drop the initial reference by fsnotify_init_mark early instead of
audit_tree_freeing_mark() at destroy time.

In the cases we destroy the mark before we drop the initial reference we need to
get rid of the get_mark that balances the put_mark in audit_tree_freeing_mark().

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Miklos Szeredi 2012-08-15 12:55:22 +02:00
parent a2140fc0cb
commit b3e8692b4d
1 changed files with 9 additions and 3 deletions
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12
kernel/audit_tree.c
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@ -292,6 +292,7 @@ static void untag_chunk(struct node *p)
spin_unlock(&hash_lock);
spin_unlock(&entry->lock);
fsnotify_destroy_mark(entry);
fsnotify_put_mark(&new->mark); /* drop initial reference */
goto out;
Fallback:
@ -330,7 +331,6 @@ static int create_chunk(struct inode *inode, struct audit_tree *tree)
spin_unlock(&hash_lock);
chunk->dead = 1;
spin_unlock(&entry->lock);
fsnotify_get_mark(entry);
fsnotify_destroy_mark(entry);
fsnotify_put_mark(entry);
return 0;
@ -346,6 +346,7 @@ static int create_chunk(struct inode *inode, struct audit_tree *tree)
insert_hash(chunk);
spin_unlock(&hash_lock);
spin_unlock(&entry->lock);
fsnotify_put_mark(entry); /* drop initial reference */
return 0;
}
@ -411,7 +412,6 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
spin_unlock(&chunk_entry->lock);
spin_unlock(&old_entry->lock);
fsnotify_get_mark(chunk_entry);
fsnotify_destroy_mark(chunk_entry);
fsnotify_put_mark(chunk_entry);
@ -444,6 +444,7 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
spin_unlock(&chunk_entry->lock);
spin_unlock(&old_entry->lock);
fsnotify_destroy_mark(old_entry);
fsnotify_put_mark(chunk_entry); /* drop initial reference */
fsnotify_put_mark(old_entry); /* pair to fsnotify_find mark_entry */
return 0;
}
@ -915,7 +916,12 @@ static void audit_tree_freeing_mark(struct fsnotify_mark *entry, struct fsnotify
struct audit_chunk *chunk = container_of(entry, struct audit_chunk, mark);
evict_chunk(chunk);
fsnotify_put_mark(entry);
/*
* We are guaranteed to have at least one reference to the mark from
* either the inode or the caller of fsnotify_destroy_mark().
*/
BUG_ON(atomic_read(&entry->refcnt) < 1);
}
static bool audit_tree_send_event(struct fsnotify_group *group, struct inode *inode,