audit: don't free_chunk() after fsnotify_add_mark()

commit 0fe33aae0e94b4097dd433c9399e16e17d638cd8 upstream.

Don't do free_chunk() after fsnotify_add_mark().  That one does a delayed unref
via the destroy list and this results in use-after-free.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Acked-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index 5bf0790497e7779cf1001f6cb30c214de812ccd5..d52d247b07a59097f487946c7ecc65cce64cacdc 100644 (file)
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -259,7 +259,7 @@ static void untag_chunk(struct node *p)
 
        fsnotify_duplicate_mark(&new->mark, entry);
        if (fsnotify_add_mark(&new->mark, new->mark.group, new->mark.i.inode, NULL, 1)) {
-               free_chunk(new);
+               fsnotify_put_mark(&new->mark);
                goto Fallback;
        }
 
@@ -322,7 +322,7 @@ static int create_chunk(struct inode *inode, struct audit_tree *tree)
 
        entry = &chunk->mark;
        if (fsnotify_add_mark(entry, audit_tree_group, inode, NULL, 0)) {
-               free_chunk(chunk);
+               fsnotify_put_mark(entry);
                return -ENOSPC;
        }
 
@@ -396,7 +396,7 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
        fsnotify_duplicate_mark(chunk_entry, old_entry);
        if (fsnotify_add_mark(chunk_entry, chunk_entry->group, chunk_entry->i.inode, NULL, 1)) {
                spin_unlock(&old_entry->lock);
-               free_chunk(chunk);
+               fsnotify_put_mark(chunk_entry);
                fsnotify_put_mark(old_entry);
                return -ENOSPC;
        }