mm/slub: fix slab double-free in case of duplicate sysfs filename
sysfs_slab_add() shouldn't call kobject_put at error path: this puts last
reference of kmem-cache kobject and frees it. Kmem cache will be freed
second time at error path in kmem_cache_create().
For example this happens when slub debug was enabled in runtime and
somebody creates new kmem cache:
# echo 1 | tee /sys/kernel/slab/*/sanity_checks
# modprobe configfs
"configfs_dir_cache" cannot be merged because existing slab have debug and
cannot create new slab because unique name ":t-0000096" already taken.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/slub.c b/mm/slub.c
index 3efcdc0..7e9e508 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -5283,7 +5283,7 @@
s->kobj.kset = cache_kset(s);
err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, "%s", name);
if (err)
- goto out_put_kobj;
+ goto out;
err = sysfs_create_group(&s->kobj, &slab_attr_group);
if (err)
@@ -5310,8 +5310,6 @@
return err;
out_del_kobj:
kobject_del(&s->kobj);
-out_put_kobj:
- kobject_put(&s->kobj);
goto out;
}