diff options
| -rw-r--r-- | mm/kasan/quarantine.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c index d8ccff4c1275..47ed4fc33a29 100644 --- a/mm/kasan/quarantine.c +++ b/mm/kasan/quarantine.c @@ -132,12 +132,23 @@ static void *qlink_to_object(struct qlist_node *qlink, struct kmem_cache *cache) static void qlink_free(struct qlist_node *qlink, struct kmem_cache *cache) { void *object = qlink_to_object(qlink, cache); + struct kasan_free_meta *meta = kasan_get_free_meta(cache, object); unsigned long flags; if (IS_ENABLED(CONFIG_SLAB)) local_irq_save(flags); /* + * If init_on_free is enabled and KASAN's free metadata is stored in + * the object, zero the metadata. Otherwise, the object's memory will + * not be properly zeroed, as KASAN saves the metadata after the slab + * allocator zeroes the object. + */ + if (slab_want_init_on_free(cache) && + cache->kasan_info.free_meta_offset == 0) + memzero_explicit(meta, sizeof(*meta)); + + /* * As the object now gets freed from the quarantine, assume that its * free track is no longer valid. */ |