Bailout early from init_cache_random_seq if s->random_seq is already initialised. This prevents destroying the previously computed random_seq offsets later in the function.
If the offsets are destroyed, then shuffle_freelist will truncate page->freelist to just the first object (orphaning the rest). This fixes https://bugzilla.kernel.org/show_bug.cgi?id=177551. Signed-off-by: Sean Rees <[email protected]> --- mm/slub.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/slub.c b/mm/slub.c index 7aa6f43..7ec0a96 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1422,6 +1422,10 @@ static int init_cache_random_seq(struct kmem_cache *s) int err; unsigned long i, count = oo_objects(s->oo); + /* Bailout if already initialised */ + if (s->random_seq) + return 0; + err = cache_random_seq_create(s, count, GFP_KERNEL); if (err) { pr_err("SLUB: Unable to initialize free list for %s\n", -- 2.9.3
