UBI: fix some use after free bugs

Move the kmem_cache_free() calls down a couple lines.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
index ead8613..c5dad65 100644 (file)
--- a/drivers/mtd/ubi/fastmap.c
+++ b/drivers/mtd/ubi/fastmap.c
@@ -463,8 +463,8 @@ static int scan_pool(struct ubi_device *ubi, struct ubi_attach_info *ai,
                                }
                        }
                        if (found_orphan) {
-                               kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
                                list_del(&tmp_aeb->u.list);
+                               kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
                        }
 
                        new_aeb = kmem_cache_alloc(ai->aeb_slab_cache,
@@ -846,16 +846,16 @@ fail_bad:
        ret = UBI_BAD_FASTMAP;
 fail:
        list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) {
-               kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
                list_del(&tmp_aeb->u.list);
+               kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
        }
        list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &eba_orphans, u.list) {
-               kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
                list_del(&tmp_aeb->u.list);
+               kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
        }
        list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) {
-               kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
                list_del(&tmp_aeb->u.list);
+               kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
        }
 
        return ret;