slab_free_freelist_hook tries to read a freelist pointer from the current object even when freeing a single object. This is invalid because single objects don't actually contain a freelist pointer when they're freed and the memory contains other data. This causes problems for checking the integrity of freelist in get_freepointer. Signed-off-by: Matteo Rizzo <matteorizzo@xxxxxxxxxx> --- mm/slub.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/slub.c b/mm/slub.c index f7940048138c..a7dae207c2d2 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1820,7 +1820,9 @@ static inline bool slab_free_freelist_hook(struct kmem_cache *s, do { object = next; - next = get_freepointer(s, object); + /* Single objects don't actually contain a freepointer */ + if (object != old_tail) + next = get_freepointer(s, object); /* If object's reuse doesn't have to be delayed */ if (!slab_free_hook(s, object, slab_want_init_on_free(s))) { -- 2.42.0.459.ge4e396fd5e-goog