Commit 7026f192 authored Feb 17, 2014 by David Howells Committed by Linus Torvalds Feb 17, 2014

FS-Cache: Handle removal of unadded object to the fscache_object_list rb tree



When FS-Cache allocates an object, the following sequence of events can
occur:

 -->fscache_alloc_object()
    -->cachefiles_alloc_object() [via cache->ops->alloc_object]
    <--[returns new object]
    -->fscache_attach_object()
    <--[failed]
    -->cachefiles_put_object() [via cache->ops->put_object]
       -->fscache_object_destroy()
          -->fscache_objlist_remove()
             -->rb_erase() to remove the object from fscache_object_list.

resulting in a crash in the rbtree code.

The problem is that the object is only added to fscache_object_list on
the success path of fscache_attach_object() where it calls
fscache_objlist_add().

So if fscache_attach_object() fails, the object won't have been added to
the objlist rbtree.  We do, however, unconditionally try to remove the
object from the tree.

Thanks to NeilBrown for finding this and suggesting this solution.

Reported-by: NeilBrown <neilb@suse.de>
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: (a customer of) NeilBrown <neilb@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 416e2abd

fs/fscache/object-list.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -50,6 +50,8 @@ void fscache_objlist_add(struct fscache_object *obj)
		struct fscache_object *xobj;
		struct rb_node *p = &fscache_object_list.rb_node, parent = NULL;

		ASSERT(RB_EMPTY_NODE(&obj->objlist_link));

		write_lock(&fscache_object_list_lock);

		while (*p) {
		@@ -75,6 +77,9 @@ void fscache_objlist_add(struct fscache_object *obj)
		*/
		void fscache_objlist_remove(struct fscache_object *obj)
		{
		if (RB_EMPTY_NODE(&obj->objlist_link))
		return;

		write_lock(&fscache_object_list_lock);

		BUG_ON(RB_EMPTY_ROOT(&fscache_object_list));

fs/fscache/object.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -314,6 +314,9 @@ void fscache_object_init(struct fscache_object *object,
		object->cache = cache;
		object->cookie = cookie;
		object->parent = NULL;
		#ifdef CONFIG_FSCACHE_OBJECT_LIST
		RB_CLEAR_NODE(&object->objlist_link);
		#endif

		object->oob_event_mask = 0;
		for (t = object->oob_table; t->events; t++)

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